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

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

Item # DM8551009
Our Price: $549.41
Fifth Wheel Installation Kit

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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)
  • Q & A (0)
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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

  • 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...
    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...
  • 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...
    view full answer...
  • Is the Demco Hijacker Autoslide Compatible with a 5th Airborne Air Ride to Use on a 2017 Ford F-350
    The autosliding 5th wheel hitches are definitely the way to go with a truck bed that is under 8 feet, like your 2017 Ford F-350 with a 6-3/4 foot bed. I like to recommend them because they eliminate the need to get in and out of your truck when cornering. They also feature the single wraparound jaw for full 360-degree contact with the king pin and a 3/4 inch steel locking bar for added security. The cushioning that they provide helps to reduce chucking and jarring and the brackets on the...
    view full answer...
  • Recommended 5th Wheel Hitch with Underbed Rail Kit for 2017 Ford F-250 Short Bed
    For your 2017 Ford F-250 4WD with a short bed and without the factory rail kit, I recommend looking at the Demco Hijacker Autoslide # DM8550022, along with the Underbed Rail and Installation Kit # DM8551009. This is an excellent 5th Wheel Hitch that features an 18,000 pound towing capacity and an automatic slider that will provide 14 inches of travel for making sharp turns in your short bed truck. It also has a premium wraparound, single-piece jaw for a secure connection with the trailer...
    view full answer...
  • 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...
    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...
    view full answer...
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  • 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...
  • Underbed Fifth Wheel Hitch Solutions for 2020 Ford F-250 Short Bed without OEM Rail Kit
    We have below the bed fifth wheel hitch and rail kits that are a confirmed fit for your 2020 Ford F-250 short bed without the OEM rail kit like Demco Hijacker Autoslide # DM8550022 that fits the underbed rail kit # DM8551009.
    view full answer...
  • Demco Hijacker Autoslide to Fit 2019 Ford F-350 with Factory 5th Wheel Prep Package
    The Demco Hijacker Autoslide fifth wheel hitch you asked about, part # DM8550022, actually fits into an aftermarket underbed kit, part # DM8551009. It doesn't fit the OEM puck system you have in your new 2019 Ford F-350. Instead you want part # DM8550024 that does fit right onto the pucks. It's basically the same hitch except for how it mounts into the truck. I've linked a video of it going into a 2014 F-350. It's the same puck system as what you have.
    view full answer...
  • 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...
    view full answer...
  • Under-Bed Fifth Wheel Rail Kit for 2017 Ford F-250 Super Duty
    The Reese Under-Bed Rail Kit # RP30073 that you referenced is designed for older model year Super Duty trucks and will not fit your 2017 Ford F-250. The under-bed kits we currently carry for your truck are the Demco # DM8551009 to be used with Demco fifth wheel hitches # DM8550032, # DM8550022, or # DM8550037 and the B&W # BWGNRK1116-5W to be used with the B&W Companion hitches # BWRVK3500-5W or # BWRVK3400-5W.
    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...
    view full answer...
    Image 1 for
  • 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...
  • 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...
  • Recommended 5th Wheel In-Bed Wiring Kit for 2020 Ford F-350 Super Duty
    Glad to hear that you are already using the Demco 5th wheel towing setup, parts # DM8550032 and # DM8551009, for your 2020 Ford F-350 with the long bed. The wiring kit I recommend using is the Bargman # 50-97-410-010 because it uses a 90 degree turn from the 7-Way in your truck bed so you don't have to worry about stress on the wiring. This simply tees into your current wiring at the back of your OEM bumper 7-Way. I have attached an installation video of this on a 2017 F-350 that you can...
    view full answer...
    Image 1 for
  • Best 5th Wheel Hitch for 2019 Ford F-250 With Short Bed
    Your 2019 Ford F-250 with a short bed is going to need a sliding fifth wheel hitch to ensure your trailer does not come into contact with your truck's cab and damaging it. The good news is there is one great option for a fifth wheel hitch that is going to make your towing experience with a short bed truck much easier because it won't require you to get out of your truck and activate the slider - the Demco Hijacker Autoslide 5th Wheel Hitch. The correct Hijacker Autoslide will depend on...
    view full answer...
    Image 1 for Image 2 for
  • 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...
    view full answer...
  • 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...
  • Recommended Demco Hijacker Autoslide with Underbed Rail Kit for 2017 Ford F-250 without Prep Package
    The Demco Hijacker Autoslide # DM8550024 referenced in your question is designed specifically to mount to the factory 5th wheel pucks on a Ford truck. It will not work on your 2017 Ford F-250 that doesn't have the factory prep package. The Ford pucks have a different configuration than the Demco Underbed Rail System that is used for the standard Hijacker models. The Demco Hijacker Autoslide # DM8550022 that you also mentioned is what you need for your Ford F-250 along with the Demco Underbed...
    view full answer...
  • Underbed Rail Kit Recommendation for 2017 Ford F-350 for Demco Hijacker Hitch
    The correct Demco underbed style rail kit for your 2017 Ford F-350 short bed is the part # DM8551009 which is a custom fit for your truck and is also a fit with your Demco hijacker hitch # DM8550022 as well.
    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...
  • 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...
    view full answer...
  • Sliding 5th Wheel Hitch With Underbed Rails for 2020 Ford F-350 Super Duty Towing Keystone Raptor
    There are two hitches that have an underbed rail system which fit your 2020 Ford F-350 Super Duty, and both have the capacity needed to tow a Keystone Raptor. I'll go over the options and make some comparisons so you are sure to get the right hitch. - Demco Hijacker Autoslide 5th Wheel Trailer Hitch with Slider # DM8550037 and Underbed Rail and Installation Kit for Demco Hijacker # DM8551009 - B&W Companion 5th Wheel Trailer Hitch with Slider # BWRVK3400-5W and Custom Underbed Installation...
    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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