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  1. Fifth Wheel Installation Kit
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2022 Chevrolet Silverado 3500

Underbed Rail and Installation Kit for Demco UMS 5th Wheel and Gooseneck Trailer Hitches

Item # DM8551009
Retail:$717.99
Our Price: $562.68
You Save: $155.31
Fifth Wheel Installation Kit
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2022 Chevrolet Silverado 3500

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Shipping Weight: 52 lbs
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Custom, underbed rail kit allows for uninhibited use of your truck bed once your hitch is removed. Works with Underbed Mount Series (UMS) fifth-wheel and gooseneck hitches. No-drill frame brackets offer a simple installation. 1-800-940-8924 to order Demco fifth wheel installation kit part number DM8551009 or order online at etrailer.com. Free expert support on all Demco products. Great prices and Fastest Shipping for Underbed Rail and Installation Kit for Demco UMS 5th Wheel and Gooseneck Trailer Hitches. Fifth Wheel Installation Kit reviews from real customers.
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  • Reviews (15)
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Demco Fifth Wheel Installation Kit - DM8551009

  • Below the Bed
  • Demco
  • Custom

Custom, underbed rail kit allows for uninhibited use of your truck bed once your hitch is removed. Works with Underbed Mount Series (UMS) fifth-wheel and gooseneck hitches. No-drill frame brackets offer a simple installation.


Features:

  • Installation kit is designed for use with Demco UMS 5th-wheel and gooseneck trailer hitches
  • Underbed rails allow for complete access to truck bed when hitch is removed
    • No exposed rails
    • 4 Mounting holes sit flush with truck bed
  • Vehicle-specific design reduces installation time and requires less drilling than universal systems
    • No-drill brackets bolt onto the outside of your truck's frame rails
    • Crossmembers sit along top of frame rails, beneath bed
  • Sturdy, black powder coated steel resists corrosion
  • Rails and installation hardware included
  • Made in the USA


Specs:

  • Application: Demco Underbed Mount Series (UMS) 5th-wheel and gooseneck trailer hitches
  • 5-Year limited warranty


8551009 Demco Hijacker UMS Under Bed Rail Frame Bracket Kit

Installation Details DM8551009 Installation instructions

This Product Fits The Following Vehicles




Customer Satisfaction Score:


Customer Reviews

Underbed Rail and Installation Kit for Demco UMS 5th Wheel and Gooseneck Trailer Hitches - DM8551009

Average Customer Rating:  3.9 out of 5 stars   (15 Customer Reviews)

Custom, underbed rail kit allows for uninhibited use of your truck bed once your hitch is removed. Works with Underbed Mount Series (UMS) fifth-wheel and gooseneck hitches. No-drill frame brackets offer a simple installation.

by:

Good kit. All the parts were sturdy and well made. Took my truck in to a local installer and he completed the installation in about 1/2 of a day. You should be aware that the installation involves unbolting the truck bed from the frame and that makes DIY a major undertaking. Unless you have the tools, equipment and skills you should plan on using a professional installer. With this kit I can remove my hitch and the truck bed is open and uncluttered for every day use. Only evidence of the hitch are the four flush plastic caps on the bed.

Sheryl

2/21/2022

Still good after one year. My hitch is easy to install and remove with the help of a modified engine hoist. The truck bed remains just that, a truck bed for hauling crap around.



by:
2017 Ford F-250 Super Duty

Easy in stall, Had my bed liner sprayed in and was afraid of scraping it taking out the hitch. Have had no problems so far even though I do it on my own. Its heavy but light enough for me to move to the back of the bed and take out with a floor hoist.

Kenneth S.

2/6/2021

It did take work too install. The bed did have to be raised up but it wasnt a big deal. I do wish they had caps that fit better in the holes because the rails do sit flush with the bottom of teh bed. Rubber s moght be better to grip in.



by:
2018 Ford F-350 Super Duty

Have this installed in my 18 F350 SRW and it works ok. Sometimes the latches bind when removing the hitch because it shifts slightly when towing.

Installation was a pain. I had to remove all of the bolts holding the bed on, then raise the bed about 3" to get the rails in. Also, the rails sit directly up against the bottom of the bed so there's no way to install the hole covers when you have the hitch removed.



by:

This rail system is certainly robust and I’m not concerned about it carrying the load of the fifth wheel at all. It is a quality product and seems to be made well. I installed this myself and it should be a relatively easy install; however, it was a huge pain. The rails install under the bed of my 2020 F-250 shortbed at the exact location where the truck frame has a bend in it. For this reason, the locking pins from the auto slide hitch above the bed couldn’t reach the under bed rail receiver holes (there was too much space since the frame rails slid down the bend in the frame). I couldn’t have installed this system by myself. With the help of a buddy, we were able to adjust the above bed hitch locking pins while one person was under the truck holding up the frame rails so they were snug with the bottom of the bed. This allowed the pins to properly drop into the frame rail receiver holes and lock the rails up against the bottom of the bed. In hindsight I could have held the rails in position by attaching them to the frame brackets first but that’s not how the instructions were laid out. This was my first fifth wheel hitch install so I guess I learned something to make my next install easier.



by:
2017 Ford F-350 Super Duty

Not so much the product, I'm sure it's great. But part number 60050 is apparently to similar the the part I received, part 6050. Paid extra for faster shipping on the original order. Because wrong parts were sent, we are returning it all. We had to locally source an entirely different hitch because we needed to install on a new truck that day. By locally sourcing, I mean drive 2 1/2 hours one way to get an above bed hitch and mounting system. Now I have a bunch of holes drilled in the bed of my truck that I didn't want and the customer service was horrible.



by:

Moderate install. Follow the instructions Don't be a man and think you can do it without them you will waste time. Read the instructions in full 1st.



by:
Dodge Durango

2019 Durango 5th wheel hitch install kit for my customers new truck

Always RV
Mesa AZ



by:
2018 Ford F-350 Super Duty



by:

The Delivery was missing parts. I called customers service they replaced and delivery next days .



by:

Great return response



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See what our Experts say about this Demco Fifth Wheel Installation Kit

  • Underbed Fifth Wheel Rail Kit Recommendation for 2017 Ford F-250
    For your 2017 Ford F-250 short bed without the factory OEM rail kit we do have under bed fifth wheel rail/hitch setups available. The best option would be the B and W Turnoverball rail kit part # BWGNRK1116 as it allows you to use the best slider hitch available the Companion part # BWRVK3400 and also because it doubles as a gooseneck hitch too. I attached an install video for this rail kit on a similar 2017 Ford Super Duty as yours for you to check out as well.
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  • Differences Between Above and Under Bed Fifth Wheel Hitch Mounts for 2020 Ford F350
    There are two ways to install a fifth wheel hitch on a pick up truck. One would be to use standard bed-mounted rails. Brackets are mounted to the truck frame with the bed rails sitting directly above. Holes are drilled down through the truck bed to correspond with holes in the brackets bolted to the frame, allowing the bed rails to be securely bolted down. The rails have slots in them that allow the hitch to be installed and removed pretty conveniently. The problem here is that once the...
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  • 5th Wheel Trailer Hitches for a 2018 Ford F-250 4x4 Both with and without Factory Prep Package
    On your 2018 Ford F-250 4x4 look in the bed. If you see the 4 pucks in the bed like in the picture I have included then you do have the factory 5th wheel prep package. If you just see the indentations where the pucks would be then you do not have the prep package. If you do have those pucks then you can use a hitch that mounts directly in them. For a long bed truck you can use the following: # BWRVK3305 # C16036 # RP30922 # DM8550033 If you have the prep package and a short bed truck...
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  • Is Demco Hijacker 5th Wheel Hitch Compatible With Underbed Rails on 2019 Ford F-250 FX4 4WD
    Yes it will; the correct parts for the Demco Hijacker and underbed rails on your 2019 Ford F-250 Super Duty FX4 are the following: - Under-Bed Rail and Installation Kit # DM8551009 - Demco Hijacker Autoslide 5th Wheel Hitch with Slider - 21,000 lb # DM8550037 or 18,000 lbs # DM8550022 The other thing you will need if you don't have one is a 5th wheel wiring harness, the Curt 5th Wheel/Gooseneck Custom Wiring Harness with 7-Pole Connector for Aluminum Beds # C57008. A Firestone air bag...
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  • Can Demco Gooseneck Adapter # DM5988 be Used with Underbed Demco Rails DM8551009
    Since you have a set of Underbed Demco Rails part # DM8551009 installed in your truck you can use the gooseneck adapter part # DM5988 that you referenced.
    view full answer...
  • 5th Wheel Trailer Hitch for a 2018 Ford F-250 with 6.5 Foot Bed and Grand Design 337 5th Wheel
    The Demco HiJacker I recommend looking at is actually # DM8550022 with installation kit # DM8551009. The one you referenced, # DM8550040, is rated for 13,000 pounds only and is designed for trucks with super short beds and not the regular short bed like you have on your 2018 Ford F-250. Demco Hijacker # DM8550022 has 3 height settings, the lowest of which is 15-1/2 inches tall measured from the top of the bed corrugations to the top of the hitch head. Once the trailer is hooked up you...
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  • Recommended Air Bag Helper Springs For a 2021 Ford F-250 4WD With Demco UMS Rail System
    I recommend the Air Lift LoadLifter 5000 Ultimate Air Springs # AL35FJ for your 2022 Ford F-250 Super Duty. These bags are confirmed to fit your F-250 with the 6-1/2' bed and 4 wheel drive powertrain. These are my favorite air bags as they have the integrated jounce spring inside the bag. This jounce spring helps to absorb bounce and will provide additional stability when you are driving around corners. The air bag mounting brackets will not interfere with the Underbed Rail and Installation...
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  • Underbed Fifth Wheel Hitch and Rail Kit Recommendation for 2017 Ford F-250
    We have the Demco underbed rail kits that fit your 2017 Ford F-250 like the part # DM8551009. With this kit installed you could use their 21k Demco hitch part # DM8550032 if you have a long bed or the auto slider part # DM8550022 if you have a short bed. The Demco hitches are USA made hitches that will work great for your application.
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  • Recommended Autosliding 5th Wheel Hitch for a 2020 Ford F-350 Super Duty
    I'm not super sure what you're looking for but it sounds like you're describing the Demco Autoslide 5th Wheel Hitch w/ Slider - Single Jaw # DM8550038. This hitch has an automatic slider that will slide toward the tailgate when making a turn and back to the cab when you come out of your turn, so there is no getting out of the truck and sliding your hitch back for clearance. Since this hitch operates the same going forward as it does going backwards, you can also reverse. Also, this hitch...
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  • Side Plates For Demco 21K Autoslide 5TH Wheel Hitch To Fit Demco UMS For 2019 Ford F-350 Super Duty
    To convert the Demco Autoslide 5th Wheel Hitch # DM8550038 from fitting the Ford under bed system to the Demco under bed you will need the Side Plates # DM6004. These will replace the current side plates and include new hardware. The Underbed Rail and Installation Kit # DM8551009 is the custom fit Demco UMS system which will fit a 2019 Ford F-350 without the factory under bed system.
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  • Best Auto Slide Hitch For 2020 Ford F-250 Super Duty That Doesn't Require Rails in the Bed
    I have a great option for you that doesn't require rails in the bed. I recommend the Demco 21K Hijacker Autoslide 5th Wheel Trailer Hitch w/ Slider part # DM8550037 and the under bed rails part # DM8551009 for the 2020 Ford F-250 Super Duty. The Hijacker is one of the easiest to use sliding fifth wheel hitches on the market because you don't have to get out of your truck to adjust the slider when you make turns which can become inconvenient especially in city traffic or bad weather. It...
    view full answer...
  • How to Tell if 2018 Ford F-250 Has Puck System to use Demco Hijacker Autoslide
    While the best and most certain way to tell if your 2018 Ford F-250 has the puck system is to call your local Ford dealer with your VIN, it should be pretty easy to tell otherwise. If your bed looks like the accompanying photo - with four accessible holes (pucks) and a gooseneck in the middle - you have the puck system. You can also tell based on how your B&W Companion mounts. If you insert it into the pucks you have the B&W Companion OEM 5th Wheel Trailer Hitch with Slider for Ford Towing...
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    Image 1 for Image 2 for
  • Does Reese Underbed Rail Adapter Work With 2017 Ford F-350 That Does Not Have Prep Package?
    There are underbed fifth wheel rails that are going to work with your 2017 Ford F-350, though the Reese system # RP30126 is unfortunately not one of them. There is good news, however, because the Custom Underbed Installation Kit # BWGNRK1116-5W works on both the 6-3/4' and 8' four-wheel drive versions of the 2017 F-350; I've added a link to a video showing you these rails being installed in a '17 F-350. The biggest benefit of these rails are that they offer you a chance to use what is considered...
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    Image 1 for Image 2 for Image 3 for
  • How Much Can a 2019 Ford F-250 Crew Cab Powerstroke Tow
    The towing capacity of your 2019 Ford F-250 Crew Cab Powerstroke with the 6-3/4' bed will vary from 14,100-16,600 lbs depending on drive type, axle ratio, and gross combined weight rating. If you can provide me with this information I would be happy to provide you with an exact capacity. The axle ratio should be listed on a tag inside the glove box and the gross combined weight rating should be listed on a tag inside the driver door jamb but if not you can always call the dealer with your...
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  • Will Bed of 2019 Ford F250 Need to Be Raised to Fit Demco DM8551009 Underbed Hitch Mounting Rails
    For your 2019 Ford F-250, Demco offers the Hijacker Autoslide in either an 18K version as part # DM8550022 or a 21K version as part # DM8550037. You'd also need the # DM8551009 under-bed rail kit. According to the installation instructions that I've linked for you, you won't need to completely remove the bed, but you will need to loosen the bolts that hold the bed on in order to slide the rails into place. This is especially true because you'll place the included vinyl sheets on top of...
    view full answer...
  • Under Bed 5th Wheel Installation Kit and Hitch for a 2017 Ford F-250 4x4 with 6-1/2 Foot Bed
    There are below the bed 5th wheel installation kits for the 2017 Ford F-250; just not any Reese kits. The reason for that is Reese makes the factory under bed install kit for Ford so they tend not to release an aftermarket kit right away (or at all in some cases) which gives Ford exclusivity to it. If you do not already have a Reese Elite Series hitch then you can go with one of the other under bed kits and a hitch for it. I would need to know the bed length of your truck and if it is...
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  • Comparing the Demco Hijacker Autoslide DM8550038 and DM8550037 for a Ford Super Duty
    The Demco Hijacker Autoslide 5th Wheel Hitch part # DM8550038 and the Demco Hijacker Autoslide 5th Wheel Hitch part # DM8550037 are the same hitch. The only difference is the side plates they come with, the former has side plates for the puck system on a Ford Super Duty whereas the latter has side plates to mount with Demco's underbed pucks which are different from the puck system on a Ford Super Duty. If you don't have the Ford puck system then you will need the Underbed Rail and Installation...
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  • Demco Autoslide 5th Wheel Hitch, Underbed Rails, and Air Bags for 2019 F-250 Super Duty 4WD
    There are air bags available that fit your 2019 Ford F-250 Super Duty with 4-wheel drive and are absolutely compatible with the Demco Autoslide 5th wheel hitch and underbed base rails. The parts you need for this are the following: - Demco Hijacker Autoslide 5th Wheel Trailer Hitch with Slider # DM8550022 - Underbed Rail and Installation Kit for Demco Hijacker # DM8551009 - Firestone Ride-Rite Air Helper Springs # F35FV I confirmed with Firestone these will fit your '19 F-250 and are...
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  • Underbed Base Rails and 5th Wheel Hitch for 2019 Ford F-350 Super Duty Short Bed
    While you cannot add the puck system as an aftermarket option to your 2019 Ford F-350 Super Duty, you can add an underbed rail system so you have a clean bed in your truck. I'm not sure what bolts you are referring to, but you would know if your truck came with the factory 5th wheel prep package. For underbed rails and a sliding 5th wheel hitch for your 2019 Ford F-350 you have a pair of options. - Underbed Rail and Installation Kit for Demco Hijacker # DM8551009 with the Demco Hijacker...
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  • 5th Wheel Hitch Recommendation for 2020 Ford F350 Short Bed
    From you description, you're wanting an easy to use hitch that provides a good level of ride quality that won't transfer all the road shock from the 5th wheel to the tow vehicle. I'd recommend the Demco Hijacker Autoslide, which is available in an 18K capacity model as part # DM8550022 or a 21K model as part # DM8550037. These hitches are compatible with the Demco # DM8551009 under-bed rail system that will leave your bed completely unobstructed once the hitch is removed. The hitch...
    view full answer...
  • Under Bed 5th Wheel Trailer Hitch and Install Kit for a 2017 Ford F-350 2-Wheel Drive Long Bed
    Reese has not yet confirmed an under bed mount for the 2017 Ford F-350 (as of 4/19/2017) but there are other under bed options available for your truck. First you can use a B&W set up using Turnover Ball hitch # BWGNRK1116-5W with the Companion 5th wheel hitch # BWRVK3500-5W. The benefit of this set up is that you will have both a gooseneck hitch and a 5th wheel hitch. The second option is to use Demco installation kit # DM8551009 with 5th wheel hitch # DM8550032. This set up costs less...
    view full answer...
  • Best Sliding Fifth Wheel Hitch Recommendation and Rail Kit for 2017 Ford F-350
    The setup I would recommend is the Demco Hijacker Auto Slide part # DM8550022 with the rail kit part # DM8551009 for your 2017 Ford F-350 without the factory tow package. This is a slider hitch that will automatically slide back as you make tight turns which is a very nice feature as getting out and activating a slider mechanism can be a hassle. Especially in inclement weather. The rail kit mentioned is an underbed kit so your bed will be clean and free of large rails when you remove...
    view full answer...
  • Demco Hijacker Trailer Hitch w/ Slider # DM8550022 Refit to Newer Truck
    The Demco Hijacker Autoslide 5th Wheel Trailer Hitch w/ Slider, # DM8550022 is specially designed to fit a Demco UMS custom underbed mounting kits sold separately from the hitch. You would need to identify exactly what make model for me to list the specific components. The Underbed Rail and Installation Kit for Demco Hijacker, # DM8551009 fits later model Ford F-350's.
    view full answer...
  • 5th Wheel Trailer Hitch and Install Kit Recommendations for a 2017 Ford F-250 with 6-3/4 Foot Bed
    5th wheel trailer pin boxes do come in different lengths but they are specific to a given trailer they are on. For example you could not put an extended length pin box on a trailer that is supposed to have a short pin box because the longer pin box would put more stress on the trailer where the pin box attaches to the trailer. Replacement pin boxes are approximately the same length as the pin boxes they are designed to replace so that you won't run into that issue. Using a pin box appropriate...
    view full answer...


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Info for this part was:

Employee Mike L
Expert Research:
Mike L
Employee Jameson C
Expert Research:
Jameson C
Employee Lindsey S
Edited by:
Lindsey S
Employee Jeff D
Installed by:
Jeff D
Employee Wilson B
Updated by:
Wilson B
Employee Kristina F
Updated by:
Kristina F
Employee Noah M
Updated by:
Noah M
Employee Justice A
Updated by:
Justice A
Employee Amanda M
Written by:
Amanda M

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