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Flex Air drastically reduces chucking, absorbs road shock, and minimizes bounce. The internal air bag and built-in strut work with the rubberized pivoting head to achieve a dramatically smoother ride. Replaces Lippert Rhino pin boxes.
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Getting there is half the fun, right? Not if you're being bumped, jerked, jammed, and pushed around from the chucking, road shock, and bounce that occurs as you tow your fifth-wheel trailer or RV. And imagine the costly wear and tear on your trailer as it endures that rocky ride.
Put the fun back into your trip and ease the stress on your trailer by replacing your factory pin box with the Curt Flex Air pin box. The internal air bag and built-in shock work together to cushion your ride, improve handling, and limit strain on both your truck and your trailer. But what sets the Flex Air apart from other air ride pin boxes is the addition of a pivoting head. This head, along with its built-in rubber compound, provides additional cushion, absorbs road shock, and reduces chucking for a significantly improved ride.
A heavy-duty rubber compound is built into the head assembly of the Flex Air pin box. This rubber is the first defense against road shock. It helps to absorb the bumps and vibrations 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 Flex Air takes the beating so there's less wear and tear on your trailer or RV and you get a smoother ride.
Because the rubber may not be able to absorb all of the road shock that you experience, the Flex Air also implements air ride technology to virtually eliminate shock. When you encounter uneven terrain on your trip or hit a pothole on the highway, the Flex Air pin box compresses vertically, similar to how a pair of scissor blades closes in on each other. This compression transfers the road shock and vibrations to the internal air bag, saving your fifth-wheel hitch, trailer, and tow vehicle frame from enduring a rocky ride.
A built-in strut, or shock, controls the Flex Air's compression so that the internal air bag doesn't burst. The strut also causes the pin box to appropriately rebound without any bounce, and positions it to be ready for the next bump in the road.
The pivoting head on Flex Air 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 Flex Air 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.
Simple Setup and Installation
First, simply remove your existing Lippert Rhino pin box from your trailer. The Flex Air uses the same bolts that held on your original pin box so no additional hardware is required for installation. Plus, the Flex Air pin box comes out of the box ready to be put on your trailer, so no assembly is needed. Because the Flex Air is quite heavy, you should put it on an elevated surface or have a friend help you support its weight during installation.
The internal air bag should be inflated after the Flex Air pin box has been mounted on your trailer. Using the air intake valve, inflate the air bag until the outer cylinder of the shock rises high enough to fully expose the yellow inflation indicator sticker.
Average Customer Rating: 4.6 out of 5 stars (163 Customer Reviews)
Flex Air drastically reduces chucking, absorbs road shock, and minimizes bounce. The internal air bag and built-in strut work with the rubberized pivoting head to achieve a dramatically smoother ride. Replaces Lippert Rhino pin boxes.etrailer did their part very well, great service, but the delivering carrier beat the crap out of my pin box. TForce trucking did a poor job handling the freight.
Replaced Rhino with this unit on my Cedar Creek 311RL. It was straight forward and simple, but not easy for this old man to do it solo. Used the tailgate as my shop. Stuck the back up in the air and drove back to insert into the bracket. I then used the levelor on the trailer to line up 2 of the holes to insert the first bolts. I used a car jack near the pin to raise the 230 pound box into line up position to insert the other 8 bolts. Torqued it down and aired it up, then test drove it. Rides like a dream. Much softer on those in the tow vehicle and I assume on the fifth wheel itself.
Service from etrailer was good. The advice and recommendations for my specific rig was a little off. But I was able to do research myself. Shipping was timely. Over all another successful etrailer transaction. Thanks to everyone.
We didn't like the way our trailer rode with this pin box. Made one trip of about 6000 miles, and when we got home removed it, and put the factory hitch back on. I called etrailer to tell them I didn't like the hitch, and was there anything they could do, and the rep said they couldn't help me at all. I'm not satisfied with the hitch, or etrailer at all.
100% worth its weight in gold! Smooth ride, easy on your equipment all the way around. You won’t regret investing in this simple yet sophisticated king pin.
All my research indicated that etrailer was helpful and a good experience for those who needed help getting the correct part.
Not the case, the order entry people were nice, but they were data entry only.
The support people gave wrong information and led to wrong parts sent and also returning parts and receive proper credit was not smooth and did not happen. Not impressed. The last part received was correct, but not because of help from etrailer. I had to call lippert because the etrailer support was not properly trained or just poor listening skills as my request for information from lippert was flawless and was able to order the correct part.
Item showed up in perfect condition! Great price compared to retailers
Was a little worried initially as to whether or not5his was actually a Lippert part-when it arrived the box was INTACT! That’s NEVER happen, regardless of who the sales point was originally.
All kidding aside, you folks at eTrailer have always taken care of us with finding the right item for the job, and this pin box is how you do so consistently with the additional bonus of saving time (arrived a week earlier than expected) and money ($225 less than the nearest competitor and included shilling!). Thank you!
Makes for a smooth ride
We have had this hitch for a year now and it’s great. When we received it, we installed it was very easy, even thought it was heavy, we installed it with the help of 2 other guys. We went out west for 2 months and it did its job, we were and have been very satisfied with this product.
Great job again.
The hitch arrived on time and in good shape however there was no owners manual or warranty paperwork with it. Called to get torque values.
Pin box came in box and pallet destroyed. Shipper had in possession for 2 days and until I called they were not planning on delivering for 2 more days. I was forced to drive to the shipper and pick up. Pin box looks ok installing tomorrow. Not happy about having to retrieve this myself.
Hitch has been wonderful and provides a great ride.
This item arrived much faster than etrailer said it would. It came by truck, and the freight company driver was very nice and made sure I opened the box before he left.
I installed it myself with some help from my 15 year old son. We used our forklift tractor attachment to put it in place. The Curt Flex Air totally changed the experience of pulling our 5er. It eliminates most of the chucking, and acts like shocks on a car, so ride returns to normal immediately after a bump in the road...which the Flex Air absorbs most of.
Do you have a question about this Fifth Wheel King Pin?
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Katrina B.
3/23/2023
Oh no! Lets get you to our customer service department and see if there is anything that we can do for you.