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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
Retail:$698.99
Our Price: $484.32
You Save: $214.67
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 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. Fifth Wheel Installation Kit reviews from real customers.
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  • Reviews (14)
  • Q & A (0)
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Demco Fifth Wheel Installation Kit - DM8551010

  • 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

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

  • 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...
  • 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...
  • Will Demco Hijacker Autoslide Work With B&W Turnovernall On 2016 GMC Sierra 2500
    The Demco Hijacker Autoslide 5th Wheel Trailer Hitch won't work with a B&W Turnovernall Gooseneck Trailer Hitch. The issue is not that they don't offer a way to attach the two but rather that the singular connection point cannot withstand the stress of an auto-sliding fifth wheel hitch. Therefore, you can either use the B&W Companion Slider Gooseneck-to-5th-Wheel Trailer Hitch Adapter part # BWRVK3400 or remove the B&W Turnovernall Gooseneck Trailer Hitch and install the Underbed Rail...
    view full answer...
  • 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...
  • Will Demco Hijacker Fifth Wheel Hitch Fit with Firestone Air Suspension in a 2015 GMC Sierra 2500
    The Firestone Ride Rite system part # F2709 that you installed on your 2015 GMC Sierra 2500 is compatible with fifth wheel rail kits so it would allow you to install a fifth wheel hitch like the Demco Part # DM8550037 that you referenced. The correct rail kit you would need to install this hitch is the part # DM8551010 which has been confirmed as a fit for your truck. The Demco Hijacker hitch you are interested in is a great hitch for towing a short bed truck as it automatically slides...
    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...
  • Can the Demco Hijacker 5th Wheel Hitch Be Used W/ a 2014 Chevrolet Silverado 2500 W/ OEM Pucks
    Hey Nick, so it looks like the only way you're going to be able to use your Demco Autoslide 5th Wheel Trailer Hitch w/ Slider # DM8550037 with your 2014 Chevy Silverado is by using the custom underbed mounting kit # DM8551010. This is one of the few hitches that does not use ISR or an OEM puck system to install so you'd have to use their install kit.
    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...
  • 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...
  • 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...
  • 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...
  • 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...
  • Recommended 5th Wheel Hitch for 2019 Chevy 2500HD Short Bed without OEM Pucks
    I recommend using the Demco Hijacker Autoslide # DM8550034 on your 2019 Chevy 2500 without the OEM prep package since the slider automatically activates, so there's no getting out of the vehicle required each time you may need to make a tight turn. I also really like that this gives you an under-bed mounting kit with the # DM8551010 so you'll still have a completely clear truck bed when you're not towing your 5th wheel. This hitch has an 18,000-lbs capacity but if you're in need of a larger...
    view full answer...
  • Can Demco SL Series 5th Wheel Hitch be Used on 2018 GMC Sierra with Factory Pucks
    I spoke with my contact at Demco and unfortunately there is not a good way to convert the SL Series 5th Wheel Hitches like # DM6076SL-16K, nor is there an adapter available, that will allow it to attach to the factory pucks on your 2018 GMC Sierra 2500. Your only option is to go with a brand new hitch that is designed to mount to those pucks. For this I highly recommend the Curt A16 Slider # C16668 if your Sierra has the 6-1/2 foot bed or the fixed A16 # C16520-16025 if you have the 8...
    view full answer...
  • Recommended Fifth Wheel Hitch Setup for 2017 GMC Sierra 3500 to Tow 2020 Keystone Fuzion
    The Curt Q20 5th Wheel Hitch # C16671 that you referenced is a great option to tow your 2020 Keystone Fuzion if you decide to have your GM dealership install their factory below bed rails. We have some great aftermarket options for you that you can get from us here at etrailer.com. Aftermarket systems are typically less expensive than factory options without sacrificing safety, capacity, or features. For a complete underbed rail 5th wheel system for your 2017 GMC Sierra 3500 Denali,...
    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...
  • 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...
  • Demco 5th Wheel Hitch That Works With A 2022 Chevrolet Silverado 2500 W/ A Short Bed
    In order for the Demco UMS Double Pivot 5th Wheel Trailer Hitch to fit your 2022 Chevrolet Silverado 2500 you would need the Underbed Rail and Installation Kit for Demco UMS 5th Wheel and Gooseneck Trailer Hitches # DM8551010, however Demco does not have a kit that is available that fits your 2022 Chevrolet Silverado 2500. Instead, I recommend checking out the Demco Autoslide 5th Wheel Trailer Hitch w/ Slider # DM8550035 with the base rails # DM39FR. This hitch has the same maximum towing...
    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...
  • 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...
  • 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...
  • 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...
  • 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...


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Info for this part was:

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Employee David F
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Employee Lindsey S
Edited by:
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Expert Research:
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