Trailair Rota-Flex 5th Wheel Pin Box - Lippert 1621 or 1621HD - 18,000 lbs
(47 reviews)
Price: $690.69
In Stock
Trailair Rota-Flex 5th Wheel Pin Box - Lippert 1621 or 1621HD - 18,000 lbs
Item # LC328330
Retail:$1,043.63
Our Price: $690.69
You Save: $352.94
In Stock
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- All Info
- Reviews (47)
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Lippert Fifth Wheel King Pin - LC328330
- Lippert 1621
- Lippert 1621HD
- 18000 lbs GTW
- Upgraded Pin Box
- Lippert
- Absorbs Road Shock and Reduces Chucking
- Fixed Turret
This Rota-Flex pin box has a pivoting head with a built-in rubber compound that works to reduce chucking and absorb road shock, resulting in a smoother ride and less wear and tear on your trailer. Replaces Lippert 1621 or 1621HD pin boxes.
Features:
- Pivoting pin box replaces standard pin box on your 5th-wheel trailer to improve handling and limit strain on the truck and trailer
- Minimizes chucking by allowing controlled movement of king pin within your hitch
- Rubber compound built into the head absorbs road shock
- Reduces wear and tear on trailer
- Black powder coat provides rust resistance
- Sturdy steel construction
- King pin connects to any 5th-wheel trailer hitch
- Bolt-on installation with no assembly required
- Made in the USA
Specs:
- Designed to replace Lippert 1621 or 1621HD 5th-wheel pin boxes
- Weight capacity: 18,000 lbs
- 1-Year limited warranty
Notes:
- Do not use the Trailair Rota-Flex pin box with any type of gooseneck adapter.
- The Trailair Rota-Flex is not compatible with Curt E-Series or Q-Series 5th wheel hitches.
The Rota-Flex pin box has a pivoting head and built-in rubber compound that help to reduce chucking and absorb road shock for a smoother ride as you tow your fifth-wheel trailer.
Pivoting Head Reduces Chucking
The pivoting head on the Rota-Flex allows for controlled back and forth movement of the king pin to reduce the uncomfortable jarring known as chucking. Unlike a rigid pin box that has little give at the point where the trailer and the hitch are connected, the Rota-Flex can pivot slightly to compensate for those times that your trailer suddenly pushes or pulls on your tow vehicle. Because the pin box head - not the king pin itself - is moving, the chucking that often occurs when the king pin jerks around inside the hitch is significantly reduced.
Rubber Compound Absorbs Road Shock
A heavy-duty rubber compound is built into the head assembly of the Rota-Flex pin box. This rubber absorbs the bumps and vibrations, or road shock, experienced when towing a fifth-wheel trailer over rough roads. Standard pin boxes without any type of shock absorption transfer road shock to your trailer, resulting in potential damage to the trailer and an overall bumpy ride. The shock-absorbing rubber inside the Rota-Flex takes the beating so there's less wear and tear on your trailer or RV and you get a smoother ride.
Easy, Bolt-On Installation
The Rota-Flex is easy to install. Simply remove your existing Lippert 1621 or 1621HD pin box and install the Rota-Flex on your trailer or RV. The Rota-Flex uses the same bolts that held on your original pin box so no additional hardware is required. Plus, it comes out of the box ready to be put on your trailer, so no assembly is needed. Because the Rota-Flex is quite heavy, you should put it on an elevated surface or have a friend help you support its weight during installation.
328330 Lippert Components (LCI) Rotaflex by Trail Air Fifth Wheel Kingpin Box for Lippert 1621 or 1621HD
Replaces UF35-946202 Ultra-Fab Rubber Ride Kingpin Box by Rota-Flex
Installation Details
Customer Satisfaction Score:
94% were satisfied with this product
6% of customers were not satisfied
- Wrong item was ordered
- Arrived Damaged
- Wrong item shipped
Customer Reviews
Trailair Rota-Flex 5th Wheel Pin Box - Lippert 1621 or 1621HD - 18,000 lbs - LC328330
Average Customer Rating: 4.7 out of 5 stars (47 Customer Reviews)
This Rota-Flex pin box has a pivoting head with a built-in rubber compound that works to reduce chucking and absorb road shock, resulting in a smoother ride and less wear and tear on your trailer. Replaces Lippert 1621 or 1621HD pin boxes.by: Gary 04/17/2024
I've had this pin box on other fifth wheel trailers with great experience.
by: Larry03/26/2022
The shipping container was not adequate for pin box. It was too large and no protective packing was used to protect the powder coated finish. When it was delivered by UPS the carton was destroyed. I had to repaint it as it was badly chipped from rough handling. I am disappointed in the performance as I do not see any difference in the chucking which is the reason why I purchased it. If I were to get a different 5th wheel I will not purchase a Rota-Flex again.
by: Ken05/02/2019
Received on Wed. as planned. With a little help from my forklift, I had this trail air pin box installed in few hours. Fit perfect on my Sabre. Drove around the block, about 4 miles. This pulls so nice, it is like nothing behind you. Thanks etrailer.
by: laluck82007/16/2016
The product was great, The better part was how fast it got to me . I had it put on the camper the same day i had received it what was 3 days after my order. Now you can't beat the shipping. All my orders from ETrailer has been fast and on time . Thank you all at Etrailer.
by: Troy05/18/2016
Looks great on my 5th. If anyone else has wondered as I did and could not find anything online regarding the vertical height difference between this trail air rota flex and my standard lippert 1621. This pin box will reduce the nose of my 5th by 2" mounted in the same location. Now to pull my rear axle spacers on my dodge to get another 1.5" lower. Etrailer is great as always. Never had a problem with them and have ordered here many times. Thanks Etrailer!
by: Anthony 08/09/2023
I was surprised at the difference one product could make in my towing experience! It really helped the chucking.
by: Michael 04/13/2023
Fast shipping and item fits perfectly. Replaced old pin box by myself with a small tractor in about 45 minutes. Can't wait to try it out on my new toy hauler.
by: Steven 12/06/2022
The difference now compared to when I had my done is like night and day, no more chucking, very little if any jarring , the ride meets al my expectations
by: Jeff 08/29/2022
The Trailair Roto-Flex is an excellent product. It really has smoothed out the ride and handling of my fifth wheel, especially over roads that aren't so perfect. I highly recommend this for an upgrade.
by: Catherine 05/14/2023
A noticeable improvement over the standard pin box. It's most obvious when starting and stopping. It was very easy to install even for two 60+ women. We're happy with the purchase.
by: Bill A.09/14/2017
This king pin assembly works well to get the chucking down. I do feel at times do to road conditions that I still feel some, but over all it has helped the ride and I feel it has take some abuse away from my truck and the trailer seems to ride better. Overall I am pleased with the kingpin assembly for the cost. The only thing I cannot do is put my cover on that was on my old kingpin.
by: Ed S.06/26/2013
Fast Shipping,Great product,It sure softens up the ride! Doesn't eliminate all the jerking but overall quite satisfied! Quality built product. Definitely not a one person job so seek out a helper to hold things Thanks Etrailer.
Gene
10/19/2013
This king pin box came on my 5th wheel, it does not help the jerking at all. I am now looking to install a different pin box.
by: Marvin09/12/2018
Had trouble receiving the hitch through UPS (they lost it --[48 miles from my residence] conversation with Stacy at etrailer and they shipped another, which my wife and I installed. etrailer was very helpful in sending another to replace the one UPS lost. Thanks so much
by: Kirk 04/22/2023
Great customer service and timely shipping.
Product was as expected.
by: Steve 04/21/2021
The Trailair Rota-Flex pin box worked great. The pin box did the job by removing 80% of the chucking as we traveled.
by: Tom04/26/2018
I received my order promptly, faster than expected for a large item. I paid for my pin box, checked the next day and etrailer had dropped the price, they refunded the difference which impressed me greatly. I am a repeat customer and have not had a bad experience ever.
by: Jeff03/26/2020
Came in mail packaged! Even the UPS man told me how etrailer is a legit company doing a great job shipping! Any in costumer service was great and her team had the price match over amazon done in one business day. Great to work with!!
by: Van 07/13/2022
Worked fine, easy to install only used for one trip to Michigan and sold trailer.
by: Anonymous03/19/2017
I purchased it as a direct replacement for the damaged on on my fifth wheel.
by: Mark 07/19/2022
Chelsea was very helpful and the product is very good. The Roto flex was very easy to install Great product.
by: Harmel04/07/2023
as Always one and done. keep it up
by: Charles 09/19/2020
Received the Roto flex pin box I ordered from etrailer in about a week. Arrived in good condition and perfect fit completely satisfied with etrailer on this order
by: Darral b08/30/2016
I haven't opened the box yet, but it was shipped as fast or faster than I ever thought possible. As far as the product goes i am sure it arrived safe and sound. Good job!
by: Mike O08/16/2017
The Roto Pin Box has eliminated 90% of my chucking. The only time I get any now is on a extreme bump but it settles down pretty quick. It was also very easy to install. Some of the bolts are a little tight to get to but doable.
by: Paul 07/06/2020
It got lost by UPS, but the service and customer service was great, received my product in excellent shape. This is a very good company to do business with. I will do business with them again. Thank you Paul.
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See what our Experts say about this Lippert Fifth Wheel King Pin
- Grade of Bolts Needed to Mount Trailair Rota-Flex 5th Wheel Pin BoxI spoke with the manufacturer and a minimum of Grade 5 hardware is recommended for installing the Trailair Rota-Flex 5th Wheel Pin Box, # LC328330 , so Grade 8 will also work.
view full answer... - Why Is The Curt Q-Series 5TH Wheel Hitch Not Compatible With Trailair 5TH Wheel Pin Box? The Curt Q24 5th Wheel Trailer Hitch # C16245 uses rubber cushioning in the head that will cause the hitch to wear out to fast when using a pin box like the Trailair Rota-Flex 5th Wheel Pin Box # LC328330. The rubber cushioning is great for providing a quiet ride experience but does not have the durability of the poly-torsion components used on a Curt A25 5th Wheel Trailer Hitch # C16180.
view full answer... - Can Pullrite 2400 be Used with RotaFlex Cushioned Pin BoxYes, you can use the Rota Flex pin boxes like the part # LC328330 with a Pullrite 2400 but you will need to use their specific Isolator for this application that we do not carry since we don't carry the Pullrite brand.
view full answer... - Will The Curt Flex Air Pin Box Add More Clearance Than The Rota-Flex Pin Box The Curt Flex Air 5th Wheel Pin Box - Lippert 1621 # LC369535 is approximately 19-9/16" in height, whereas the Trailair Rota-Flex 5th Wheel Pin Box - Lippert 1621 # LC328330 is approximately 13-3/16" in height. This will give you the additional clearance you were looking for but you will need to check the bolt pattern of your current pin box to ensure that it is in fact a 1621 bolt pattern. If you can find the serial/RPO numbers on it we can look it up or you can use the attached guide...
view full answer...
- Which Trailair Rota-Flex Pin Box Compatible with Lippert 1621 Pin BoxI have a solution for you, but the Trailair Rota-Flex # LC176440 pin box is designed to replace 5th wheel trailers with a Lippert 1116 pin box and not the 1621 pin box. Instead, you'll want to use either the # LC328330 (trailer with GVWR of less than 18000-lbs) or the # LC328329 (trailer of GVWR less than 21000-lbs). The Trailair Rotaflex is a great solution to help reduce the bouncing and jarring that car be experienced with an uncushioned pin box and will be a great upgrade for your towing...
view full answer... - Is The Rubber Cushion In The Lippert Trailair Rota-Flex Pin Box Replaceable The cushion block on the Trailair Rota-Flex 5th Wheel Pin Box # LC328330 is not a replaceable part so I would first reach out to Lippert directly to see if this would qualify for a warranty replacement. If not you'd be looking at replacing the entire pin box. To do this you would have to first determine the bolt pattern. There's typically a sticker that has a serial number and RPO number that we can use to verify the bolt pattern, otherwise you'll need to follow the steps listed in the...
view full answer...
- Will a B&W Companion Slider Work w/ a Rota Flex Pin Box?Yes, you can use the B&W Companion 5th Wheel Trailer Hitch w/ Slider item # BWRVK3400-5W with the Trailair Rota-Flex 5th Wheel Pin Box item # LC328330. The Companion has 1" thick dual jaws provide 360-degree jaw-to-king-pin contact. This ensures less rattle and more security than slide-bar jaws. The slider that is built into the base of the Companion allows for 12" of fore and aft travel to give you the clearance you need. I have linked a installation video. The Custom Underbed Installation...
view full answer...
- Difficulty Getting Jaws to Open on B&W Companion Hitch with Rota-Flex Pin Box on TrailerThe king pin on the Rota-Flex pin boxes does pivot and if you are parked on uneven ground then it is possible that the hitch jaws are bound up some. Moving the truck and trailer to level ground or even pulling forward or backward a little could be enough to release the tension and make it easier to uncouple the trailer. There isn't any sort of adjustment you can make on the pin box that would help. You could also try lubricating the moving parts of the hitch to make them easier to operate....
view full answer... - Warranty on the Trailair Rota-Flex 5th Wheel Pin BoxThe Trailair Rota-Flex 5th Wheel Pin Box # LC328330 has a 1-year warranty according to the manufacturer. This pin box is designed to replace a Lippert 1621 or 1621HD 5th wheel pin box so you'll want to make sure that's what you have by checking out the sticker or placard on your current pin box. I've added a link to a video review for you to check out as well of the Trailair Rota-Flex 5th Wheel Pin Box # LC328330.
view full answer... - Can You Replace Your 5th Wheel Pin Box With A Higher Capacity One To Triple Tow A Boat Trailer Manufacturers recommend only using 80-85% of a pin box's capacity so you would definitely be putting too much of a strain on the pin box if you were to exceed the capacity and would most likely have something fail. Swapping pin boxes is as simple as unbolting the old one and popping in the new one, but there are limitations due to the strength of the trailer's frame. Manufacturer's don't really want you to upgrade because the higher capacity pin boxes weigh more and you're throwing off...
view full answer... - Replacement Pin Box Solution To Allow More Turning Clearance than What Demco Hijacker OffersThe Reese 5th Airborne Premium # RP61412 which is the upgrade to the Sidewinder would be great options to replace an RBW 7028 pin box. Since I wasn't able to find a 7026 option, your pin box is most likely a 7028 but you will want to double check just to make sure if you are able to. The problem is that you'll have to go with a different fifth wheel hitch as the Demco Hijacker Autoslide cannot be used with a Sidewinder. The Reese # RP30047 would then be a great option for use with the...
view full answer... - Can Curt Q20 Fifth Wheel Hitch be Used with Rota Flex Cushioned Pin BoxYou cannot use a Curt Q20 # C16130 with a Rota Flex cushioned pin box like the part # LC328330. For a very similar hitch that can be used with it you'd need the A20 part # C16140 which has the upgraded jaw and head design that allows it to be used with that pin box.
view full answer... - Can Demco Hijacker Autoslide Fifth Wheel Hitch be Used with Rotaflex Cushioned Pin BoxYou can use the Demco Hijacker Autoslide fifth wheel hitches like part # DM8550034 with the Rota Flex pin boxes but you have to use the required adapter part # DM6171 which allows the head of the hitch to attach to the pivoting plate of the Rota-Flex for Lippert 1621 and 1621HD Pin Boxes part # LC328330.
view full answer... - Will Trailair Rota-Flex 5th Wheel Pin Boxes Fit a Rhino BoxThe Trailair Rota-Flex 5th Wheel Pin Boxes, # LC328330 and # LC328329 are replacement/upgrades for the Lippert 1621 or 1621HD pin boxes. These will not fit a Rhino Box. However, we do have the MORryde Cushioned 5th Wheel Pin Boxes, # MR44HR for 11K to 14K and the # MR55QR for 18K to 21K trailers w/ Lippert Rhino and the Curt Flex Air 5th Wheel Pin Box - Lippert Rhino - 21,000 lbs., # LC65VR.
view full answer... - Rota-Flex Pin Box Replacement For Lippert 1621HDThere is a Rota-Flex pin box that will replace your 1621HD pin box, but I checked with the manufacturer, and the part number you mentioned will not fit as a replacement. Instead, the correct Rota-Flex for your 1621HD is the following: - Trailair Rota-Flex 5th Wheel Pin Box # LC328330 The # LC328330 does have an 18,000 lb capacity, so if you were looking for a replacement cushioned pin box with a 21,000 lb capacity like the one in your question, you'd need to go with a different option,...
view full answer... - What are the Dimensions of the Trailair Rota-Flex Pin Box # LC328330I went out to our warehouse to measure the Trailair Rota-Flex Pin Box, # LC328330, and found that the width is 12 inches. When measuring the length of a pin box, you want to find the distance from the center of the king pin to the bolt holes. The distance from the front row of bolt holes to the center of the king pin is 17-3/4 inches. The distance from the back row of bolt holes to the king pin is 25-5/8 inches. A few other measurements that you will want to consider are the bolt hole diameter,...
view full answer... - Which Trailair Rota-Flex 5th Wheel Pin Box Fits a 2013 Dutchmen Voltage V3105Thank you very much for all the information. I was able to use this and determine that you have a Lippert 1621HD pin box. Therefore the correct replacement for your 2013 Dutchmen Voltage V3105 is the Trailair Rota-Flex 5th Wheel Pin Box part # LC328330. There will not be any issues using the Trailair Rota-Flex 5th Wheel Pin Box with your B&W Patriot 5th Wheel Trailer Hitch w/ Slider part # BWRVK3270.
view full answer... - Trailair Rota-Flex for Fitting 2021 Sabre Cobalt 5th WheelIn the picture you send in I can see there's a Lippert components tag on the side of the pin box and if you measured already and what you have matches a 1621 then the Rota Flex # LC328330 that you referenced would be correct. If you are not sure though if you can give me the numbers off of the tag I can check with Lippert to verify.
view full answer...
- Does Trailair Rota-Flex Work With Curt A-Series 5th Wheel HitchYes, the Curt A-Series of 5th wheel hitches - including your Curt A16 sliding hitch - is 100 percent compatible with the Trailair Rota-Flex 5th Wheel Pin Box - Lippert 1621 or 1621HD - 18,000 lbs # LC328330. It is the E-Series and Q-Series that the Rota-Flex is not compatible with, and that is because the head units on those hitches are spherical, which means they don't offer enough stability to be used with the Rota-Flex's cushioning. But the A-Series has a different, upgraded type of...
view full answer... - 5th wheel RV Bounces Using a Curt Q20 in a 2012 Ram 3500 and Trailair Rota-Flex 5th Wheel Pin BoxThe Trailair Rota-Flex 5th Wheel Pin Box, such as the # LC328329 and # LC328330 are not compatible with the Curt Q20 5th Wheel Trailer Hitch, # C16130. Lippert has in the notes for their product "The Trailair Rota-Flex is not compatible with Curt E-Series or Q-Series 5th wheel hitches". I cannot say for positive that this conflict is 100 percent of your issue but it is a good starting point. If you want to consider changing the 5th wheel hitch, I suggest the B&W Patriot 5th Wheel Trailer...
view full answer... - Recommended Upgraded Pin Box For A 2017 Keystone RV Raptor 5th Wheel Toy Hauler 425TSThe Rota Flex pin box comes in either a 1621 # LC328330 or 1116 # LC176440 bolt pattern. For an upgrade I recommend the Trailair Flex Air 5th Wheel Pin Box # LC369535 for a 1621 bolt pattern or the Trailair Air Ride 5th Wheel Pin Box # LC155943 for a 1116 bolt pattern. These pin boxes are both rated for 21,000lbs to ensure you safely tow your 2017 Keystone RV Raptor 5th Wheel Toy Hauler 425TS with a 15860lbs dry weight. The Flex Air drastically reduces chucking, absorbs road shock, and...
view full answer... - Can You Lower A Trailair Rota-Flex Pin Box On A 2021 Keystone Raptor 423 You can definitely lower the Trailair Rota-Flex 5th Wheel Pin Box - Lippert 1621 or 1621HD - 18,000lbs # LC328330 but you will still need to use 4 four bolts on each side too secure the pin box to the mounting ears of your 2021 Keystone Raptor 423. Failure to do so could result in serious injury or worse. If the leaf springs on your trailer happen to be currently mounted above the axles (overslung), you might be able to use an Over-Under Conversion Kit like # K71-385-00 for 3 inch diameter...
view full answer... - Mounting Reese Sidewinder Pin Box on Trailer I'm not quite sure what you mean by only using only one row of bolt holes when installing the Reese Sidewinder King Pin # RP61410 in place of the Fabex 500 on your trailer. I looked through the installation instructions and it recommends taking note of the number of bolts that were used to attach the factory pin box and use at least this many when installing the Sidewinder turret. I simply recommend bolting up the Sidewinder in the same manner that the Fabex unit was mounted to ensure...
view full answer... - Replacing Lippert Rota-Flex with Reese Goose Box on 2018 Grand Design SolitudeTo replace your existing Rota-Flex 5th wheel pin box with the Reese Goose Box 5th-Wheel-to-Gooseneck Air Ride Coupler Adapter # RP85FR, you'll need to confirm its model number and weight rating. This information is typically displayed on a sticker or plate on the pin box itself. Lippert makes three models of the Rota-Flex, so the weight rating on the label is enough to identify which of these three you have: -Model 1621/1621HD Trailair Rota-Flex 5th Wheel Pin Box 18,000 lbs # LC328330 -Model...
view full answer...
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Katrina B.
4/4/2022
With the Rota-Flex, it is meant to reduce the amount of chucking that comes with hauling a 5th Wheel trailer. However, there are a lot of factors that can be the cause of chucking, such as: the nose being high or the nose being down, too much weight in the rear of the trailer, or even a 5th Wheel hitch that has a more loose or lower tolerances in the jaw. Due to all of these factors, you might not be able to notice any difference or the chucking can even become worse, depending on the situation. I also see that you have received some damage to your pin box, when it comes to shipping, it is possible that the pin box could have been scratched. We recommend using a rust-oleum type of paint to prevent any corrosion. I have a link below for your reference. I have also sent this information over to our customer service team for them to better assist you.
Helpful Links
faq-rust-prevention-maintenance.aspx