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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 # DM8551001
Retail:$610.00
Our Price: $408.61
You Save: $201.39
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. 1-800-496-5010 to order Demco fifth wheel installation kit part number DM8551001 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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Demco Fifth Wheel Installation Kit - DM8551001

  • 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.


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
    • Brackets mount to the outside of your truck's frame rails - drilling is required
    • 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


8551001 Demco Hijacker UMS Under Bed Rail Frame Bracket Kit

Installation Details DM8551001 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 - DM8551001

Average Customer Rating:  5.0 out of 5 stars   (2 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.

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

  • Can a 5th Wheel Trailer be Towed by a 2005 Ford F-150 with 5-1/2 Foot Bed
    Yes, you can tow a 5th wheel trailer with your 2005 Ford F-150 with the 5-1/2 foot bed but it will require either a specific 5th wheel trailer hitch or a fixed (non-sliding) hitch and a replacement Sidewinder pin box if one exists for the factory pin box on the trailer. The easiest solution and least expensive is to go with the specific hitch, the Demco 13K HiJacker, # DM8550041. This hitch can travel 22-1/2 inches and it does so automatically. It fits a custom under bed mount, # DM8551001....
    view full answer...
  • Under Bed Mount Fifth Wheel Rail Kit and Hitch Recommendation for 2011 Ford F-150 5-1/2 ft Bed
    An underbed mount fifth wheel rail kit will not reuse the same holes in the bed of your truck as a set of above-the-bed rails would have used in your truck. The holes would either need to be patched or left as-is. Since you have a 5-1/2 foot bed 2011 Ford F-150 the best solution we have is the part # DM8550041 which is a sliding fifth wheel hitch that automatically slides back as you make tight turns and unlike most sliding hitches it actually slides back far enough for how short your...
    view full answer...
  • Autosliding 5th Wheel Trailer Hitch for a 2012 Ford F-150 with a 5-1/2 Foot Bed
    Fifth wheel trailer towing with an F-150 that has a 5-1/2 foot bed is tough. From our experience nothing gives you enough travel to make a complete 90 degree turn without contact between the trailer and truck cab. There are exceptions based on how the front of the trailer is designed, and there are some that get close but most can't do it. Even using a Sidewinder with a fixed hitch doesn't always give you enough clearance, however it is the best option. With that being said the autosliding...
    view full answer...
  • Fifth Wheel Hitch Recommendation for 2004 Ford F-150 5-1/2 foot Bed
    There's only one slider hitch available that's going to give you the needed clearance to make tight turns without cab interference. That's the Demco Hijacker Autoslide part # DM8550041 which will slide back 22-1/2 inches automatically as you make tight turns so that you have the needed turning clearance. Then for a rail kit to install this hitch you'll need the Demco rail kit part # DM8551001 which is a custom kit for your 2004 Ford F-150. This means it will install without frame drilling...
    view full answer...
  • Does Fifth Wheel Hitch King Pin have to Center Over Rear Axle of Truck
    The center of the king pin of a fift wheel trailer needs to be centered over the rear axle. Since fifth wheel trailers are pretty heavy if you had the pin weight behind the rear axle you'd unload the front axle which would make braking and handling dangerous. I believe you have a 2005 Ford F-150 with a 5-1/2 foot bed. For bed this short there's one slider hitch that can slide far enough back to give you the needed turning clearance and it's the Demco hijacker auto slide part # DM8550041....
    view full answer...
  • Fifth Wheel Hitch Recommendation for 2011 Ford F-150 with 5-1/2 foot Bed
    We have one slider hitch that can slide back far enough to give you the needed clearance to make tight turns with your 2011 Ford F-150. For that we have the Demco Hijacker part # DM8550041 which will automatically slide 22-1/2 inches back when making tight turns. To install the hitch you'd need the rail kit part # DM8551001 which is custom fit for your truck as well.
    view full answer...
  • Slider Hitch Recommendation for 2013 Ford F-150 5-1/2 foot Bed
    For 5-1/2 foot beds there is only one slider hitch we offer that slides far enough to allow turning clearance. That would be the Demco Hijacker part # DM8550041 as it slides 22-1/2 inches and the hitch you referenced only slides 12. For a rail kit that is custom fit for your 2013 Ford F-150 with a 5-1/2 foot bed and the Demco we have the # DM8551001 which would be what you would need.
    view full answer...
  • Determining Pin Weight for 8k Trailer and Fifth Wheel Hitch Recommendation for 2014 Ford F-150
    There is not an easy way to verify the tongue weight of a fifth wheel trailer if you do not already have the trailer. The best way to find the tongue weight of your fifth wheel trailer is to use a commercial scale like those at truck stops or at material supply centers. First you should weigh your tow vehicle without the trailer connected. Next, connect your trailer to your tow vehicle and drive it on the scale. The difference between the two weights is the tongue weight. Since you do...
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  • Fifth Wheel Hitch Recommendation for 2007 Ford F-150 5-1/2 ft Bed
    A truck bed that is only 5-1/2 feet in length needs more slider clearance than what a standard slider hitch like the Curt E16 you mentioned can provide. You'll need around 22-1/2 inches of additional clearance and this hitch only provides 12 inches. We have one hitch setup that will work great for that though. The Demco Hijacker 13k Autoslider part # DM8550041 slides back 22-1/2 inches automatically as you make tight turns. To install it in your truck bed will require an underbed rail...
    view full answer...
  • Determining Demco Hijacker Autoslide 13k Would Provide Clearance for 2012 Ford F-150 5.5' Bed
    It sounds like you might be using the wrong formula to determine if you have enough clearance to make 90 degree corners with your 2012 Ford F-150 with a 5-1/2 foot bed. The formula is: (A + B) - C = Clearance A = Distance from the fifth wheel jaw center to the truck cab B = Offset used (slider clearance) C = Width of the nose of the trailer divided by 2. I was able to determine from the numbers you gave that we have the C figure determined and B since we know slider length of the Demco...
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  • Trailer Hitch and Rail Kit for 2014 Ford F-150 5.5 ft Bed to Tow 5th Wheel Trailer
    We can help you get setup with a way to tow your 2018 Heartland Elkridge Extreme light E293 but since your 2014 Ford F-150 has a 5-1/2 foot bed (shorter than most short beds) your current slider hitch would not provide enough clearance to prevent cab and trailer nose interference. So what you'll need is a slider hitch that can provide about twice as much sliding clearance as what you have now with the Demco Hijacker UltraGlide part # DM8550041 which slides 22-1/2 inches automatically as...
    view full answer...
  • Recommended Underbed 5th Wheel Hitch for a 2010 Ford F-150 with 5-1/2' Bed
    I do have a solution for you but choices are limited for underbed mounting considering the frame size and bed length. That said, I do have one perfect option for you in the Demco Hijacker Autoslide 5th Wheel Trailer Hitch part # DM8550041 which can then be used with the Underbed Rail and Installation Kit part # DM8551001 on a 2010 Ford F-150 with 5-1/2' bed. This is an underbed mounted hitch which offers enough travel for full turns with a short bed.
    view full answer...
  • Install Kit to Use Demco 13K HiJacker 5th Wheel Hitch in a 2014 Ford F-150 with 5-1/2 Foot Bed
    In order to use the Demco 13K HiJacker # DM8550041 you will need the proper under bed installation kit for your 2014 Ford F-150 with 5-1/2 foot bed. The installation kit needed is # DM8551001. No other parts are required but I do recommend installing an in bed 7-Way, # 41157, to make hooking up the trailer easier without having to use extensions.
    view full answer...
  • Is a Sliding 5th Wheel Trailer Hitch Required to Tow with a 2007 Ford F-150 with a 6-1/2 Foot Bed
    Since your 2007 Ford F-150 has a 6-1/2 foot bed you will need a sliding fifth wheel hitch unless the trailer has a Revolution or Sidewinder pin box. Without either you likely won't have enough clearance to execute sharp turns without the truck and trailer making contact. I recommend the Demco Hijacker Autoslide # DM8550022. The Hijacker is an auto sliding hitch so there's no need to get out of your truck when you're executing turns. Most sliding hitches require you to get out of the...
    view full answer...
  • Recommended 5th Wheel Hitch for a 2005 Ford F-150 5-1/2 Foot Bed
    I can help explain this evolution to you to help you better understand. The reason short bed trucks like your 5-1/2 foot Ford F-150 needed the sidewinder was because of clearance. A sliding hitch alone wouldn't give the camper/rv enough room when turning to not impact the truck cab. Due to popular demand the Sidewinder was born and allowed many short bed truck customers to tow because it moved the pivot point from a standard non-sliding hitch back 22 inches. The Sidewinder essentially...
    view full answer...
  • Underbed Rail Kit Recommendation for 2005 Ford F-150 that Fits Ford Rail Kit Hitch
    The Demco underbed rail kit you mentioned is not compatible with a fifth wheel hitch that fits factory Ford fifth wheel rail kits. But we do have the Reese Elite rail kit part # RP30064 that is a fit for your 2005 Ford F-150 that would fit with a fifth wheel hitch that was designed for OEM Ford rail kits.
    view full answer...
  • Can a Reese Goose Box Adapter be Used in a 2014 Ford F-150 with 5-1/2 Foot Bed
    The Reese Goose Box # RP94716 couples to any 2-5/16 inch gooseneck ball so it is not vehicle specific. However unless the trailer was one designed to be towed by a short bed truck it will not matter. The adapter does not provide any additional length beyond the stock pin box on the trailer. If the trailer has the tapered front end designed specifically to work with short bed trucks then you will be fine. But if not then the only alternative is to install a 5th wheel trailer hitch that has...
    view full answer...
  • 5th Wheel Trailer Hitch Recommendation for a 2011 Ford F-150 with 5-1/2 Foot Bed
    Because your 2011 Ford F-150 has the 5-1/2 foot bed there is only one set up that features a slider hitch that will work. The hitch is the Demco HiJacker 13K # DM8550041. This is an autosliding hitch with 22-1/2 inches of travel and since you have the super short bed you will need that match travel to avoid the trailer making contact with the trailer when making tight turns. For an installation kit that works with your truck and the hitch use # DM8551001. Regular slider hitches should...
    view full answer...
  • Recommended Options For Towing Fifth Wheel Trailer With Truck That Has 6-1/2 Ft Bed
    It is really hard towing a trailer with a gooseneck adapter behind a truck that has a 6-1/2 ft bed. Turning clearance will be a problem and a goose box like part # RP94716 will not give you additional horizontal clearance. In my opinion I recommend installing a fifth wheel slider in your truck. This would give you the clearance and turning capability you will need with a 6-1/2 ft bed. If you want to let me know the year make and model of the truck I will be glad to make some recommendations...
    view full answer...
  • Is There A Sliding 5th Wheel Hitch for a 2009 Ford F-150 with 5-1/2' Bed
    I do have a sliding 5th wheel hitch that will work on a 2009 Ford F-150 with 5-1/2' bed, the Demco Hijacker Autoslide 5th Wheel Trailer Hitch part # DM8550040 which has a unique auto-slide mechanism that won't require you to get out of the truck each time you need to make a sharp turn. In order to use this, you'll need the Demco Hijacker Premier Series Above-Bed Base Rails and Custom Installation Kit part # DM8552004-71. Please note, most sliding 5th wheel hitches don't provide enough...
    view full answer...
  • Can a 2013 Ford F-150 4x4 with 5-1/2 Foot Bed Tow a 5th Wheel Trailer
    Yes and no. Most slider hitches do not offer enough travel for a super short bed truck to make tight turns without the truck cab and trailer hitting each other. So in that situation you would have to use a fixed hitch and a Sidewinder pin box to move the pivot point of the trailer back. There is now a Demco HiJacker hitch, # DM8550041, that slides automatically 22-1/2 inches so you will not have to replace the pin box with a Sidewinder. For your 2013 Ford F-150 you would also need installation...
    view full answer...
  • Recommended 5th Wheel Hitch For 2012 Ford F-150 With 5.5 Foot Bed
    For the 2012 Ford F150 with a 5.5 bed, I recommend the Underbed Rail and Installation Kit for Demco Hijacker UMS 5th Wheel and Gooseneck Trailer Hitches # DM8551001 and the Demco Hijacker Autoslide 5th Wheel Trailer Hitch w/ Slider - Single Jaw - Under Bed - 13,000 lbs # DM8550041. This is the only system that does not require you to change your pin box out for a Sidewinder. No other sliding hitch will be compatible, but this system automatically slides to provide you with proper clearance...
    view full answer...
  • Fifth Wheel Trailer Hitch and Rail Kit Recommendation for 2011 Ford F-150 with 5-1/2 foot Bed
    Yes we have fifth wheel hitch options that would work well on your 2011 Ford F-150 with a 5-1/2 foot bed. Since your truck bed is so short there is only one slider hitch we offer that will slide far enough back to give you the needed clearance to make tight turns. For that you would want the Demco Hijacker part # DM8550041 which actually automatically slides as you make tight turns which is an added benefit. For the rail kit you would need the part # DM8551001 which is a custom fit kit...
    view full answer...
  • 5th Wheel Trailer Hitch and Install Kit for a 2012 Ford F-150 with 5-1/2 Foot Bed
    I have the perfect 5th wheel trailer hitch for your 2012 Ford F-150 with 5-1/2 foot bed. It is the Demco HiJacker # DM8550041. This hitch travels 22-1/2 inches and slides automatically so you will not have to use a Sidewinder. To install this hitch you just need the proper installation kit for your truck which is # DM8551001. This is an under bed mount so when the hitch is removed the bed will be clear. If you do not mind above the bed rails in the truck bed then you can use hitch #...
    view full answer...


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Info for this part was:

Employee Lindsey S
Edited by:
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Employee Jameson C
Expert Research:
Jameson C
Employee Joshua S
Video Edited:
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Employee Laura H
Updated by:
Laura H
Employee Wilson B
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