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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: DM8551010
In Stock
$497.22
Retail:$623.18
You Save: $125.96
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 DM8551010 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 (14)
  • Q & A (0)
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2016 Chevrolet Silverado 2500 - 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 Satisfaction Score:


Customer Reviews

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

Average Customer Rating:  3.9 out of 5 stars   (14 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:

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

Etrailer Expert

Sierra K.

8/23/2021

That is because this product only fits vehicles without The OEM Prep Package. You want something like this: Item # DM6194.



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:

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

Kirk C.

7/26/2020

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.



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:
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:

It arrived in two days. Great delivery.



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2012 Chevrolet Silverado



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14
14

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

  • Parts Needed To Install Demco Autoslide 18K 5TH Wheel Hitch On 2019 GMC Sierra 2500 With UMS
    Yes, you do have the correct part numbers. For your Demco Autoslide 5th Wheel Trailer Hitch # DM8550034 the Side Plates # DM6003 are the part number 6003 you referenced. To mount on the Underbed Rail and Installation Kit # DM8551010 for your 2019 GMC Sierra 2500 you will need the Side Plates # DM6004.
    view full answer...
  • Will the Demco UMS Series Gooseneck Hitch Fit a 2015 Silverado 2500 Short-Bed?
    As long as the rails you currently have installed on your 2015 Silverado 2500 short bed are the UMS style rails, like the Demco # DM8551010, you can definitely use the Demco Hijacker UMS Series Gooseneck Trailer Hitch # DM5988. If you have another brand of auto slider and or rails, however, I cannot guaranty the fit.
    view full answer...
  • Demco Underbed Rail System Dimensions for a 2016 GMC Sierra 2500
    Thanks for the picture! Those holes are not from an OEM puck system because the cab to tailgate dimensions are too short. It looks like the previous owner used the Underbed Rail and Installation Kit for Demco UMS 5th Wheel Hitches item # DM8551010. This system worked similar to an OEM puck system but only with Demco hitches. I have linked a dimensional drawing below for you to compare to what is currently on your truck. I have also attached an installation video. Since your 2016 GMC Sierra...
    view full answer...
    Image 1 for Image 2 for
  • Best Kind of Truck and Hitch to Tow a 5th Wheel Trailer
    To start the best trucks for 5th wheel or gooseneck trailer towing are going to be 1-ton long bed trucks. With a short bed you can run into clearance issues when turning and additional equipment would be required in order to solve that problem. The best hitch for towing a given trailer is going to be the one that matches that type of trailer. So in other words the best hitch for towing a 5th wheel trailer is a 5th wheel hitch. So I do recommend removing the adapter that is on it and using...
    view full answer...
  • Parts Needed To Use Demco Hijacker With OEM Prep Package On 2021 Chevrolet Silverado 2500 HD
    Congratulations on the new truck! To change your Demco Hijacker Autoslide # DM8550022 that was made for the Underbed Rail and Installation Kit # DM8551010 on your 2017 GMC Sierra 2500 HD to work with your new 2021 Chevrolet Silverado 2500 HD W/ OEM Prep Package you will need to change the side plates and use a rail adapter. The correct parts are Replacement Side Plates for Demco Hijacker Autoslide 5th Wheel Trailer Hitches # DM6003 and Demco 5th Wheel Rail Adapter for Chevy/GMC OEM...
    view full answer...
  • Can the Demco Hijacker 8550034 be Used with an Under Bed Mount Kit on a 2019 Chevy Silverado 3500
    Absolutely, the Demco Hijacker Autoslide 5th Wheel Trailer Hitch part # DM8550034 is for above bed mounting rails. However, you can make it compatible with the underbed mounting kit for your 2019 Chevrolet Silverado 3500 which is the Underbed Rail and Installation Kit for Demco Hijacker part # DM8551010 by obtaining the Replacement Side Plates for Demco Hijacker Autoslide 5th Wheel Trailer Hitches part # DM6004. I also recommend that you purchase an in-bed 7-way like the Demco 5th Wheel/Gooseneck...
    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...
  • 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...
  • 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...
  • How to Install the Demco 18K Hijacker Autoslide 5th Wheel Trailer Hitch on a 2011 GMC Sierra 2500
    In order to mount the Demco 18K Hijacker Autoslide 5th Wheel Trailer Hitch part # DM8550022 in the bed of your 2011 GMC Sierra 2500 you will need to use the Underbed Rail and Installation Kit for Demco Hijacker Hitches part # DM8551010. The Replacement Side Plates for Demco Hijacker Autoslide 5th Wheel Trailer Hitches part # DM6004 that you referenced is designed to allow the above bed version of the Demco 18K Hijacker Autoslide 5th Wheel Trailer Hitch part # DM8550034 to be used with...
    view full answer...
  • Slider Kit Availability For A Reese 22K Series 5th Wheel Hitch
    We do offer slider kits for Reese hitches like the Reese Square Tube Slider for 5th Wheel Trailer Hitch # RP30048 that works with 15K, 16K, or 20K Reese 5th wheel hitches. However, unfortunately your Reese 22K Fifth Wheel Hitch # 30034 is not a compatible hitch for these sliders. If you need a slider hitch for your Silverado, I recommend the Demco Hijacker Autoslide 5th Wheel Hitch # DM8550037 with the rail kit # DM8551010. This awesome hitch is capable of towing a maximum of 21,000 lbs,...
    view full answer...
  • 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...
  • 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...
  • 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...
  • Best Fifth Wheel Hitch Recommendation for a 2015 GMC Sierra 2500 Short Bed
    Since you have a short bed truck you are going to need to get a slider fifth wheel hitch to allow you to make tight turns. Since getting out and operating the slider every time you get to a parking lot can be a bit of a hassle I would recommend the Demco Hijacker AutoSlide part # DM8550022. This hitch will automatically slide back when making tight turns. If you are looking for the best setup this would be it. The rail kit you would want would be the underbed kit part # DM8551010 that...
    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...
  • How to Tell if 2016 Chevy Silverado 2500 Has Factory Rail Kit for Fifth Wheel Hitch
    Most likely you would know if you had the Factory Rail Kit in your 2016 Chevy Silverado 2500. There would be holes in the bed of your truck that the feet of a fifth wheel hitch would fit into. I attached a picture that shows what they pucks/holes would look like. If you have them the B and W Hitch part # BWRVK3700 that you referenced would fit and work well. Otherwise for an underbed fifth wheel hitch setup I would recommend the Demco Hijacker part # DM8550022 which will automatically...
    view full answer...
    Image 1 for
  • 7-Way Trailer Wiring Connector for Bed of 2016 GMC Sierra 3500
    Sounds you are referring to 7-way wiring ran to the very rear of the truck near the bumper. So what you would need to install a 7-way in the bed of the truck is the 5th wheel 7-way wiring kit part # 50-97-410. This plugs inline to that connector and gives you a harness and 7-way that will reach up to the wheel well. I attached an install video for this kit on a 2016 GMC Sierra 3500 just like yours as well.
    view full answer...
  • Underbed Demco Hijacker Hitch and Rail Kit Recommendation for 2016 GMC Sierra 3500
    There is a great underbed rail system that Demco offers for their Demco Hijacker Autoslide hitches. The rail system you'd need for your 2016 GMC Sierra without the factory rail kit is the part # DM8551010. Then for a hitch you'd need the part # DM8550022 for the 18k version or the part # DM8550037. The Trailair pin boxes can be used with the Demco Hijacker but not the RotaFlex. To use one with a Mor/Ryde pin box requires the locking plate part # DM6025.
    view full answer...
  • Best Autoslide Fifth Wheel Hitch With Underbed Rails for 2018 Chevy Silverado 2500
    For your 2018 Chevy Silverado 2500 there is a great auto-slide fifth wheel hitch available with underbed rails, the Demco Hijacker Autoslide 5th Wheel Trailer Hitch w/ Slider # DM8550022 which you would mount with Underbed Rail and Installation Kit for Demco Hijacker UMS # DM8551010 The Hijacker is a premier hitch with an automatic slider which is a great quality-of-life feature because it means not having to hop in and out of your Chevy just to make a sharp turn. This hitch offers complete...
    view full answer...
  • Fifth Wheel Rail Kit to Install Demco AutoSlide Fifth Wheel Hitch in 2019 Chevy Silverado 3500
    The Demco Hijacker Autoslide hitch part # DM8550034 is a great hitch that can easily be used in the bed of your 2019 Chevy Silverado 3500 without the factory rail kit. Demco recommends their rail kit part # DM8552011-71 which is a confirmed fit for your 2019 Chevy Silverado 3500. This is a custom fit kit which means it will minimize drilling and install time when compared to a universal kit.
    view full answer...
  • 5th Wheel Trailer Hitch and Install Kit for a 2016 GMC Sierra 2500 Long Bed
    First you will need an installation kit to mount the 5th wheel hitch in your 2016 GMC Sierra 2500 long bed. There are kits with rails above the bed and kits below the bed. The advantage of below the bed is that the bed is clear when the hitch is removed. If you want to go with above the bed rails I recommend Reese custom installation kit # RP56001-53. There is no drilling required to install the frame brackets and the longer rails and outboard frame brackets make installation much easier...
    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...
  • 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...


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Info for this part was:

Employee Joe V
Test Fit:
Joe V
Employee David F
Test Fit:
David F
Employee Lindsey S
Edited by:
Lindsey S
Employee Michael H
Expert Research:
Michael H
Employee Jameson C
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Jameson C
Employee Joshua S
Video Edited:
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Employee Jacob T
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