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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
Retail:$717.99
Our Price: $562.96
You Save: $155.03
Fifth Wheel Installation Kit

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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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2020 Ford F-250 Super Duty - Underbed Rail and Installation Kit for Demco UMS 5th Wheel and Gooseneck Trailer Hitches

  • 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

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

  • Under Bed Installation Kit and 5th Wheel Hitch Recommendations for a 2017 Ford F-350
    There are under bed installation kits available for the 2017 Ford F-350 even if Reese hasn't released one just yet (4/4/2017). I recommend the Demco kit # DM8551009. For a hitch it will depend on if you have a short or long bed. For a short bed I recommend the HiJacker # DM8550022 for an 18K or # DM8550037 for a 21K. Both of these hitches slide automatically and have 14 inches of travel. I have linked a video review of the 21K version for you. If you have a long bed then you will not...
    view full answer...
  • 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...
  • 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...
  • Demco Hijacker Autoslider and UnderBed System for a 2022 Ford F-350 Super Duty
    The Underbed Rail and Installation Kit for Demco Hijacker UMS 5th Wheel and Gooseneck Trailer Hitches item # DM8551009 does fit your 2022 Ford F-350 Super Duty. These are the under bed rails you will need for the Demco Hijacker Autoslide 5th Wheel Trailer Hitch w/ Slider - Single Jaw - Underbed - 18,000 lbs item # DM8550022 to work in your F-350 as well. This hitch slides automatically as you drive to give you 14" of additional clearance for tight turns. You will not have to get out of...
    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...
  • 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...
  • 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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  • 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...
  • 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...
  • 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...
    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...
  • Can Demco Hijacker Autoslide 5th Wheel Hitch be Used in Long Bed Truck
    While sliding fifth wheel hitches aren't necessary for long bed trucks, there is no reason you cannot use your existing Demco Hijacker Autoslide 5th Wheel Trailer Hitch # DM8550022 in your new 2017 Ford F-450. You will not have any issues when it comes to the sliding mechanism and travel of the hitch. If your F-450 does not have the factory rail kit, you can use the Demco Underbed Rail and Installation Kit # DM8551009. This kit is custom-fit for this truck and will allow you to mount...
    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...
  • 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...
    view full answer...
  • 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...
    view full answer...
  • 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...
    view full answer...
  • 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
  • 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...
  • 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...
    view full answer...
  • 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...
  • Under Bed Auto Sliding Fifth Wheel Hitch Options for 2020 Ford F-250
    We do have a good mounting option to install a fifth wheel hitch in your truck bed without needing the rails that sit in the truck bed. Demco actually has an under-bed mounting kit, part # DM8551009 which would be used along with the # DM8550034 Hijacker Autoslide 18K rated hitch. When the hitch is removed, there will only be 4 holes in the truck bed, similar to the OEM puck system. To provide a 7-way tailer connector in the truck bed, you'd need the # DM8555002 wiring harness. I've...
    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...
    Image 1 for Image 2 for
  • 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...
  • 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...
    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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