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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 # DM8551010
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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. 1-636-306-4830 to order Demco fifth wheel installation kit part number DM8551010 or order online at etrailer.com. Free expert support on all Demco products. Guaranteed Lowest Price 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 (12)
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2014 GMC Sierra 3500 - 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


8551010 Demco Hijacker UMS Under Bed Rail Frame Bracket Kit

Replaces Demco DM8551002 and DM8551003

Installation Details DM8551010 Installation instructions


Customer Reviews

Underbed Rail and Installation Kit for Demco UMS 5th Wheel and Gooseneck Trailer Hitches - DM8551010

Average Customer Rating:  4.1 out of 5 stars   (12 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:

The instructions provided with the hitch were very detailed and provided enough information for me to install it myself. I love having the mounting rails below the bed. the auto slide worked flawlessly. For the winter I left the hitch coupled with the trailer to keep my bed clear.




by:

Merchandise arrived in good condition. Nothing missing. The shipping carton was in terrible condition. It was torn open from shipping, however nothing was missing or damaged . The product will fill my needs to replace the above bed rails that don't leave a clean bed when fifth wheel is removed. This will fill the bill. Thanks to Etrailer this will work perfectly for my Demco hijacker fifth wheel. Shipment was quick delivery.




by:

This product is nice but doesn’t line up with OEM placement of pucks.


Comments
That is because this product only fits vehicles without The OEM Prep Package. You want something like this: Item # DM6194.
-- Etrailer Expert Sierra K - 08/23/2021


by:
2017 GMC Sierra 2500

First package was destroyed in shipping, all hardware was missing, called etrailer forgot her name ( sorry ) very polite. she ordered all the correct hardware needed and had it shipped out. Except for the shipping was very pleased with etrailer.




by:

Kit made for my rig and fit as described. Installation a little on the difficult side for your typical DIY'er.


Comments
The under bed kit is the best. Having the truck bed useful when not traveling is great. I use a small electric hoist and casters for lifting and moving so the weigh is no problem. Installation was a little on the difficult side but any experienced DIYer can handle it.
Kirk C - 07/26/2020


by:
2018 Chevrolet Silverado 3500

Once I mounted everything and figured out I had to switch passenger and drivers brackets everything was fine it worked out ok




by:
2012 Chevrolet Silverado




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by:

It arrived in two days. Great delivery.




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12
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See what our Experts say about this Demco Fifth Wheel Installation Kit



  • Do 16k and 20k Fifth Wheel Hitches Connect to Same Size King Pin
    All of the fifth wheel hitches we carry are designed to fit the same size king pin on a trailer. A 16k hitch would work just as well to connect to a fifth wheel trailer as a 20k fifth wheel hitch. I attached a link to a page that has all of the 20k fifth wheel hitches we offer.
    view full answer...
  • Installation of UMS Demco 18K Auto Slide Base Rails on a 2015 GMC 2500 Sierra Diesel Crew Cab
    I took a look at the directions and they are straight forward and provide clear diagrams. According to them there may be the need to trim the heat shield on some models but they provide another excellent diagram showing exactly where to trim if this is needed for your truck. I have linked a few images for you to check out. They also recommend lifting the trucks rear end for better access to install base rails. The manufacturer does offer two methods of install based on your situation. Estimated...
    view full answer...
    Image 1 for Image 2 for Image 3 for
  • Are there Covers for the Holes in Underbed Rail and Installation Kit # DM8551010
    There are no covers for the holes for the Underbed Rail and Installation Kit # DM8551010. That means that it is possible for debris to get in the holes. If that happens and it affects the fit of the hitch then I recommend using compressed air to clear out the debris.
    view full answer...
  • Install Instructions for Demco Fifth Wheel Rail Kit # DM8551002
    If you check out the video I attached below you'll see an install we did for the Demco rail kit part # DM8551010 on a 2016 Chevy Silverado 2500HD just like yours. This will walk you through the entire process and will be more helpful than the written instructions.
    view full answer...
  • Are There Replacement Brackets For DM8551010
    The brackets and hardware are not available as separate purchases, so you would need to get the full kit, which is the Underbed Rail and Installation Kit for Demco Hijacker UMS 5th Wheel and Gooseneck Trailer Hitches # DM8551010. I have added a link below to a video install for you to check out as well if you'd like to take a look.
    view full answer...
  • Demco Hijacker Autoslide Underbed Fifth Wheel Trailer Hitch on 2016 GMC Sierra 2500
    For your 2016 GMC Sierra 2500 with a 6-1/2 foot bed the Demco Hijacker Autoslide # DM8550022 is the underbed fifth wheel hitch you'll want. It installs with the Custom Underbed Rail and Installation Kit # DM8551010. The Hijacker is an autoslide that will travel up to 14 inches. With many sliding hitches you need to get out of your truck to adjust the slider, make your turn, and then adjust it back to continue towing. With the Hijacker it will automatically slide when you're making your...
    view full answer...
  • Recommended 5th Wheel Hitch And Underbed Rail Kit Compatible With Revolution On 2012 GMC Sierra 2500
    There is only one underbed rail and hitch system we carry that is compatible with your 2012 GMC Sierra 2500 and a Revolution pin box. My recommendation is the Demco Hijacker UMS Double Pivot 5th Wheel Trailer Hitch - Single Jaw - Underbed - 21,000 lbs, # DM8550032 and the Underbed Rail and Installation Kit for Demco Hijacker UMS 5th Wheel and Gooseneck Trailer Hitches, # DM8551010. This system will give you a rail free design that will allow full access to your truck bed then hitch is...
    view full answer...
  • 5th Wheel Hitch Recommendation For 2017 Chevy Silverado Short Bed
    You will want to install a below bed rail style of fifth wheel rail kit in your 2017 Chevy Silverado 2500 short bed since you want truck bed access when not towing. I really like the Demco Hijacker setup that uses the under bed rails part # DM8551002 which are custom fit for your truck. Then since you need a slider hitch to make tight turns you would want the Demco Hijacker Autoslide part # DM8550022 which will slide as you make tight turns.
    view full answer...
  • Underbed Fifth Wheel Hitch and Rail Kit Recommendation for 2016 GMC Sierra 2500 Short Bed
    For your 2017 GMC Sierra 2500 short bed we do have fifth wheel hitch rail kits that are underbed which would be very similar to the factory GM rail kit. My favorite option to recommend is the Demco rail kit part # DM8551010. The reason this rail kit is great is that it's underbed like you said you needed but also because it allows you to install a sliding hitch that slides automatically as you make tight turns. For that you'd want the part # DM8550022.
    view full answer...
  • Gooseneck Hitch Adapter Recommendation for the Demco Fifth Wheel UMS Rail Kit DM8551010
    The Demco Rail Kit part # DM8551010 that you referenced is a confirmed fit for your 2015 GMC Sierra 2500 Short Bed. The gooseneck hitch adapter you would need to go with this rail kit is the part # DM5988.
    view full answer...
  • Is Demco Hijacker Autoslide Hitch Solid Hitch for 2015 Chevy Silverado 2500HD Short Bed
    The Demco Hijacker Autoslide part # DM8550034 is a really great, solid hitch that makes towing a fifth wheel trailer with a short bed truck much easier since you don't have to get out and operate the slider mechanism. To install it in your 2015 Chevy Silverado 2500 short bed would only require you to install the Demco rail kit part # DM8551010 and you'd be set.
    view full answer...
  • Weight of Demco Hijacker Autoslide 5th Wheel Hitch Underbed Mount for 2016 GMC Sierra 2500
    The Demco Hijacker Autoslide 5th Wheel Trailer Hitch with Slider - Underbed Mount # DM8550022 has a shipping weight of 300 lbs, so when you subtract its shipping material it comes in at approximately 290 lbs. This hitch is a fit for your 2016 GMC Sierra 2500 when mounted in the Underbed Rail and Installation Kit for Demco Hijacker UMS 5th Wheel and Gooseneck Trailer Hitches # DM8551010. I have added a link to an installation video of those rails in an '18 Sierra 2500 for you to check...
    view full answer...
  • Best Fifth Wheel Hitch Recommendation for 2017 Chevrolet Silverado 3500 Short Bed
    For your 2017 Chevy Silverado 3500 with a 6-1/2 foot bed the best fifth wheel hitch setup we have is the Demco Hijacker Auto Slide part # DM8550037. Since you have a short bed truck you have to have a slider hitch to allow you to make tight turns. Since most slider hitches make you get out and manually operate them the benefit to the Demco is that it does this automatically as you turn saving you the hassle. Then for a rail kit you'd want the part # DM8551010 which is a custom fit underbed...
    view full answer...
  • Auto Sliding Fifth Wheel Hitch and Rail Kit for 2015 Chevy Silverado 2500HD
    Since there isn't a way to connect an automatic sliding fifth wheel hitch to a B and W Turnoverball gooseneck hitch you will have to remove your current hitch gooseneck hitch to accomplish this. The Demco Hijacker Autoslide part # DM8550037 is the hitch I recommend as it has a 21k capacity and slides automatically as you make tight turns like you are wanting. This hitch also installs to underbed rails which will leave your truck bed a more empty when not towing. The correct rail kit for...
    view full answer...
  • Installing Demco 5th Wheel Underbed Rails Compatible with Demco 8550022 Fifth Wheel Hitch
    For your Demco Hijacker Autoslide 5th Wheel Trailer Hitch w/ Slider - Single Jaw - Underbed - 18,000 lbs # DM8550022 the Underbed Rail and Installation Kit for Demco Hijacker UMS 5th Wheel and Gooseneck Trailer Hitches # DM8551010 will work well. I've attached the installation details to help you determine the mounting to your frame which will then give you the correct bed locations. I've attached a drawing from the installation instructions as well as the complete instructions to assist.
    view full answer...
    Image 1 for
  • Gooseneck Adapter that Fits Demco UMS Underbed Rail Kit of GMC Sierra
    For the UMS underbed fifth wheel rail kit you have installed in your 2015 GMC Sierra 2500 all you'd need is the part # DM5988 and you'd be set.
    view full answer...
  • Recommended Sliding 5th Wheel Hitch for 2019 GMC Sierra 2500 Duramax
    I recommend using the Demco Hijacker Autoslide # DM8550037, which has a 21,000-lbs capacity and can be adjusted between 15-1/2 - 18-1/4 inches tall. This is an automatic sliding hitch, so there won't be any need to get in and out of the vehicle each time you need to perform a tight turn that might otherwise have your trailer getting a little too close for comfort to the truck cab. You will need to use the custom installation kit # DM8551010 to provide you with the mounting rails for the...
    view full answer...
  • Auto Sliding Fifth Wheel Hitch for 2017 Chevy Silverado 2500 Short Bed without OEM Rail Kit
    We don't carry the Pullrite brand of hitches but we do offer an auto sliding hitch setup that will work just as good if not better than the Pullrites which aren't height adjustable. The Demco Hijacker AutoSlide part # DM8550037 is a really great auto sliding hitch that is a little easier to install and use than the Pullrite too since it doesn't require a capture plate. It also has a 21k trailer towing capacity. This installs in an underbed rail kit for your truck with part # DM8551010...
    view full answer...
  • Recommended Rail Kit to Move the Demco Hijacker from 2008 Ford F-350 to 2016 Chevy Silverado 2500
    The only thing that you will need to change to be able to use the Demco Hijacker 18K # DM8550022 on your 2016 Chevrolet Silverado 2500 is a new underbed rail and installation kit. Since the chassis on a 2008 Ford F-350 and a 2016 Chevrolet Silverado 2500 are different, you will need to use a different installation kit. The kit that you will need to use for your Silverado is part # DM8551010. I also recommend installing a 5th wheel and gooseneck wiring harness. Tow Ready has a 7-Pole...
    view full answer...
  • Recommended 5TH Wheel Hitch With Underbed Rails For a 2016 GMC Sierra 2500 Short Bed
    I recommend the Demco Hijacker Autoslide 5th Wheel Trailer Hitch # DM8550022 for your 2016 GMC Sierra 2500 short bed. This hitch is rated for 18,000lbs and will automatically slide away from your truck as you turn, ensuring that your truck cab and trailer do not come into contact when you are trying to maneuver your 5th wheel trailer. And since it does it automatically you will not have to get out of your truck to reposition into a maneuvering position. The hitch will work with most 12"...
    view full answer...
  • Will the Demco Hijacker Work with a MOR/ryde Pin Box
    Yes, the Demco Hijacker Autoslide 5th Wheel Trailer Hitch part # DM8550022 with the Underbed Rail and Installation Kit part # DM8551010 will fit your 2015 Chevrolet Silverado 2500 with the 6-1/2' bed and work with the MOR/ryde pin box you have on your 2018 Jayco Eagle 5th Wheel Trailer. However, in order to prevent the kingpin from rotating inside the hitch you will need to use a locking plate like part # DM6025.
    view full answer...
  • Recommended Slider 5th Wheel Hitch With Clean Bed Once Removed for a 2016 Chevy Silverado 2500
    The best fifth wheel hitch option for a 2016 Chevrolet Silverado 2500 6.5' bed without prep package is the Demco Hijacker Autoslide 5th Wheel Trailer Hitch. The reason that this hitch is the best option is because of the auto-slide mechanism which will allow you to make tight turns without having to get in and out of the truck to adjust the hitch. It will also allow for a clean truck bed when using part # DM8550037 which is rated at 21,000 lbs with the Underbed Rail and Installation Kit...
    view full answer...
  • 18k Slider Hitch Recommendation for 2020 Ram 3500 with OEM Rail Kit
    If you are going to be over the towing capacity of your fifth wheel hitch it would time to replace it with a higher rated one. You may have gotten away with it in the past and can't see any obvious signs of fatigue or stress but that doesn't mean you'd always be able to get away with. Since you need a slider hitch due to having a short bed truck one really great solution is an automatic sliding hitch like the Demco Hijacker part # DM8550034. As you go to make tight turns this will slide...
    view full answer...
  • Parts Needed To Install Demco Hijacker Autoslide With Underbed Rails On 2017 Silverado 2500 Diesel
    I definitely understand how the above bed rails can get in the way when your Demco Hijacker Autoslide 5th Wheel Trailer Hitch w/ Slider # DM8550034 is removed. There is a way to convert your Hijacker # DM8550034 to underbed rails but you will need to install the Underbed Rail and Installation Kit for Demco Hijacker # DM8551010 and remove your current above bed rail system. You can then use Replacement Side Plates for Demco Hijacker Autoslide 5th Wheel Trailer Hitches # DM6004 to allow...
    view full answer...


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Info for this part was:

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