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

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

Part Number: DM8551009
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$545.91
Retail:$717.99
You Save: $172.08
5th Wheel Hitch Rails

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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 5th wheel hitch rails 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. 5th Wheel Hitch Rails reviews from real customers.
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  • Reviews (16)
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2021 Ford F-250 Super Duty - Underbed Rail and Installation Kit for Demco UMS 5th Wheel and Gooseneck Trailer Hitches

  • Below the Bed
  • Custom
  • Demco

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

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   (16 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:

My truck did not come with the puck system and I use my truck to haul stuff other than my 5th wheel. The underbed rails work great because my 5th wheel hitch drops right in and leaves the bed empty when I take it out. I dont have to worry about lifting things around in bed rails and it looks clean when the bed is empty.



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:

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



by:

Great return response



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2018 Ford F-350 Super Duty



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See what our Experts say about this Demco 5th Wheel Hitch Rails

  • 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.
    view full answer...
  • 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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  • 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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  • Under Bed 5th Wheel Rail Kit and AutoSlider Hitch Compatible with 2019 Ford F-350 Without OEM Pucks
    The Under-Bed Rail and Installation Kit for Reese Elite Series 5th Wheel Trailer Hitches #30068 was discontinued and is only compatible with commercial 34 inch frames, so it won't fit your 2019 Ford F-350. I reached out to Reese and they don't currently have a model compatible with the 2017-2019 model trucks. I do have an option for you that gives you the under bed rails and the automatic slider you are seeking, but you won't have the pucks like the factory option. I attached a photo...
    view full answer...
    Image 1 for
  • Gooseneck Hitch For Demco Hijacker UMS Series Rails Installed on a 2018 Ford F-350 Super Duty.
    Since you have the Underbed Rail and Installation Kit for Demco Hijacker UMS # DM8551009 on your 2018 Ford F-350 Lariat you will need the Demco Hijacker UMS Series Gooseneck Trailer Hitch # DM5988. This hitch will drop right into your rails and it has a 25,000lb trailer weight capacity, with the tongue weight capacity being 6,250lbs. The Demco Hijacker SL Series Gooseneck Trailer Hitch # DM5992 will only work with SL rail systems like the Custom Installation Kit w/ Base Rails for Demco...
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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...
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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...
  • Best Autosliding 5th Wheel Hitch for a 2020 Ford F-250 Super Duty
    The best autosliding 5th wheel hitch on the market is the Demco Hijacker which comes in a variety of options depending on what your 2020 Ford F-250 Super Duty is equipped with. If your Super Duty has the OEM Prep Package then we have the 18K # DM8550024 and the 21K # DM8550038 options which secure directly to the pucks in your bed. For a Super Duty that doesn't have the OEM Prep Package you can either use the 18K # DM8550034 or the 21K # DM8550035 with the above-bed rails # DM8552031-71...
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  • Choosing Between the Demco Autoslide and B&W Companion for 2020 Ford F-250 without OEM Prep Package
    I can understand why a hitch like the Demco Hijacker Autoslide # DM8550022 (18k) or # DM8550037 (21k) is so attractive; they provide a much better solution for towing a 5th wheel with a short bed truck when it comes to not having to get in and out of the truck each time you need to make a tight turn. With that said, they're not compatible with B&W Turnoverball Underbed kits like the # BWGNRK1116-5W since the hitches connect to the underbed kit in two very different ways. In order to use...
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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...
    view full answer...
  • 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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    Image 1 for
  • Determining Pin Weight Of a 5TH Wheel Trailer When Adding Additional Cargo
    The only way adding 1718lbs of cargo to your 5th wheel would increase the hitch weight the same amount would be if you place all the weight directly over the hitch. Since this really isn't feasible you will not see your hitch weight increase that amount. To give yourself a rough estimate if your cargo weight is loaded half way between the hitch point and the axles then 50% of the weight is a rough calculation on the additional hitch weight. Do remember to add the weight of your 5TH Wheel...
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  • 5th Wheel Base Rails For Eaz-Lift Hitch or Underbed Rails & Sliding Demco Hitch For 2019 Ford F-250
    Thanks so much for the photos they were really helpful, and what I can tell you is that those are not OEM holes for the factory puck system on your 2019 Ford F-250; what it looks to be is that the previous owner had a gooseneck hitch that they removed. So you do have a couple of options, which are to get new above-bed base rails and install your current Eaz-Lift hitch, or go with the underbed rails and Demco sliding hitch. While I do see some rails in your photo, you will need new rails...
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    Image 1 for Image 2 for
  • Puck System Availability for a 2017 Ford F-250 Super Duty with a 6-3/4 Bed
    Although there are no 5 puck mounting systems available as of May 2018, we do have some underbed systems for your 2017 Ford F-250 Super Duty with a 6-3/4' bed. If the option to tow a gooseneck or 5th wheel trailer with a single underbed system is what you are looking for then the B&W Gooseneck Hitch # BWGNRK1116-5W is what you're needing. This system gives you a gooseneck hitch and hitch ball that is compatible with the B&W Companion Slider # BWRVK3400-5W which allows you to tow a 5th...
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  • Recommended 5th Wheel Hitch for Towing a 10,500 lb GVWR Trailer with a 2017 Ford F-250
    Since you have a short bed on your 2017 Ford F-250 it is best to go with a sliding 5th wheel hitch. The sliding feature will help to keep your trailer from contacting the cab on your truck in tight turning situations. The best option that we have to offer is the Demco Hijacker Autosliding 5th wheel hitch. The autosliding feature on this 5th wheel hitch makes tight turns much easier because you don't have to get in and out of your truck to lock and unlock the sliding feature like what you...
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  • Firestone Air Bags Compatibility With a 2019 Ford F-250 FX4 That Has Demco Underbed Rail System
    Yes, the Firestone Ride-Rite Air Helper Springs # F35FV will work with your 2019 Ford F-250 FX4 and the Demco Underbed Rail and Installation Kit # DM8551009. The top air bag bracket mounts to the bottom of the frame rails so that there is no interference with the bracket on the side of your frame rail that the Demco kit uses. I recommend the Air Lift WirelessAIR Compressor System # AL74000EZ for supplying air to your air bags. This system allows you to adjust your air pressure from either...
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  • What is the Difference Between an Under-Bed and Above-Bed 5th Wheel Base Rail Kit 2018 Ford F-350
    In order to install the Demco Hijacker Autoslide 5th Wheel Trailer Hitch w/ Slider part # DM8550035 for above-bed base rail kits or part # DM8550037 for below-bed base rail kits on your 2018 Ford F-350 Super Duty you will need a set of 5th wheel base rails. We currently have two different sets of base rail kits for your truck; under-bed and above-bed. The above-bed base rail kit like the Demco Hijacker Premier Series Above-Bed Base Rails and Custom Installation Kit for 5th Wheel Hitches...
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  • 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
  • Recommended 5th Wheel Hitch and Air Bags for a 2018 Ford F-250 FX4
    For your 2018 Ford F-250 FX4, I highly recommend the Demco Hijacker Autoslide 5th Wheel Trailer Hitch part # DM8550022 with the Demco Hijacker Premier Series Under-Bed Base Rails and Custom Installation Kit part # DM8551009. The auto slide feature means that you will not have to enter and exit your truck each time you need to make a sharp turn because the hitch will automatically slide back for you to prevent any cab to loft contact. This will be a very worthwhile feature for a full-timer...
    view full answer...
  • Correct Demco Hijacker Autoslide 5th Wheel Trailer Hitch For A 2017 Ford F-250
    The Demco Hijacker Autoslide 5th Wheel Hitch part # DM8550038 is specifically designed to fit Ford trucks that were equipped with the factory prep package and cannot be installed unless you have this package or have the dealer install it. I do however, have the same 5th wheel hitch in the Demco Hijacker Autoslide 5th Wheel Trailer Hitch part # DM8550037 that is compatible with your 2017 Ford F-250 Super Duty using the Demco Hijacker Premier Series Below-Bed Base Rails and Custom Installation...
    view full answer...
  • Demco Autoslide 5th Wheel Hitch For 2019 Ford F-250 That Mounts in Underbed Rails
    There is absolutely a Demco Autoslide 5th wheel hitch for your 2019 Ford F-250 that mounts in underbed rails so you can remove it and use your F-250's bed. I'll list out what you'll need, and please not there are two Autoslide hitches, one with an 18k capacity and the other with a 21k capacity so you'll want to choose the right one for your application. - Demco Hijacker Autoslide 5th Wheel Trailer Hitch w/ Slider - 18,000 lbs # DM8550022 or 21,000 lbs # DM8550037 - Underbed Rail and Installation...
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  • Compatibility of 2018 Ford F-250 Crew Cab Towing 5th Wheel Trailer with Sliding Hitch
    For your 2018 Ford F-250, you will be fine towing that trailer as long as you don't exceed the truck's rated capacity when the trailer is fully loaded. I recommend using a tongue weight scale like the etrailer # e99044 to determine your tongue weight. I see you asked the question from the Demco Hijacker Autoslide 5th Wheel Hitch w/ Slider - Single Jaw - Ford Super Duty Prep Package - 18K # DM8550024 which is a great sliding hitch. If you don't have the factory prep package pucks, then...
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  • 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.
    view full answer...
  • USA-Made B&W and Demco 5th Wheel Hitches with Under-Bed Installation Kit for 2019 Ford F-350
    For your 2019 Ford F-350 dually without the factory 5th wheel prep we can help you with an under-bed 5th wheel install kit similar to the OEM kit to keep the bed free of base rails that can get in the way when you're using the truck for cargo applications. For a short bed I recommend the B&W 20K Slider hitch # BWRVK3400-5W and the under-bed install kit # BWGNRK1116-5W. If you have a long bed you'll use the same install kit but instead use a fixed hitch # BWRVK3500-5W. I strongly urge...
    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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