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THIS ITEM IS NOT A FIT FOR
1964 Chrysler Imperial
Demco

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

Part Number: DM8551009
18 Reviews | 60 Questions
In Stock
$549.55
Retail:$755.00
You Save: $205.45
 5th Wheel Hitch Rails
Not Confirmed to Fit

1964 Chrysler Imperial

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demco 5th wheel hitch rails custom underbed rail and installation kit for ums gooseneck trailer hitches
demco 5th wheel hitch rails below the bed dm8551009
demco 5th wheel hitch rails dm8551009
demco 5th wheel hitch rails custom
demco 5th wheel hitch rails below the bed dm8551009
demco 5th wheel hitch rails below the bed

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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 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. 5th Wheel Hitch Rails reviews from real customers.
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Demco 5th Wheel Hitch Rails - DM8551009

  • 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


8551009 Demco Hijacker UMS Under Bed Rail Frame Bracket Kit

Installation Details DM8551009 Installation instructions

This Product Fits The Following Vehicles






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Customer Satisfaction Score:

Ratings & Reviews

4.0

18 reviews
5 Stars
(11)
4 Stars
(1)
3 Stars
(3)
2 Stars
(1)
1 Star
(2)
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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 profile picture

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. profile picture

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:
Kit was easy to install once the bed was loosened up and is holding up very well. The reason I did not give 5 stars were the included star bolt adapters were a softer steel and would skip and pop out. Ended up getting a separate hardened steel socket to complete the job.
by:
My truck did not come with the puck system and I use my truck to haul stuff other than my 5th wheel. The underbed rails work great because my 5th wheel hitch drops right in and leaves the bed empty when I take it out. I dont have to worry about lifting things around in bed rails and it looks clean when the bed is empty.
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:
Dodge Durango
2019 Durango 5th wheel hitch install kit for my customers new truck

Always RV
Mesa AZ
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:
The Delivery was missing parts. I called customers service they replaced and delivery next days .
by:
Haven’t installed it yet but it looks like everything is there.
by:
Great return response
by:
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by:
2018 Ford F-350 Super Duty
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See what our Experts say about this Demco 5th Wheel Hitch Rails

Do you have a question about this 5th Wheel Hitch Rail?
  • 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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  • How Much Can a 2019 Ford F-250 Crew Cab Powerstroke Tow
    The towing capacity of your 2019 Ford F-250 Crew Cab Powerstroke with the 6-3/4' bed will vary from 14,100-16,600 lbs depending on drive type, axle ratio, and gross combined weight rating. If you can provide me with this information I would be happy to provide you with an exact capacity. The axle ratio should be listed on a tag inside the glove box and the gross combined weight rating should be listed on a tag inside the driver door jamb but if not you can always call the dealer with your...
    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...
  • 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...
  • Under Bed 5th Wheel Rail Kit and AutoSlider Hitch Compatible with 2019 Ford F-350 Without OEM Pucks
    The Under-Bed Rail and Installation Kit for Reese Elite Series 5th Wheel Trailer Hitches #30068 was discontinued and is only compatible with commercial 34 inch frames, so it won't fit your 2019 Ford F-350. I reached out to Reese and they don't currently have a model compatible with the 2017-2019 model trucks. I do have an option for you that gives you the under bed rails and the automatic slider you are seeking, but you won't have the pucks like the factory option. I attached a photo...
    view full answer...
    Image 1 for
  • Availability of Installation Video for DM8551009
    Hi Scotty; I'm sorry to say we do not have an installation video for the # DM8551009. The best I can offer is an installation from a 2015 F-350 with a similar kit that might help give you get a feel for what the process is like. I also attached a link to the written instructions below for your reference.
    view full answer...
  • Demco UMS Underbed Hitch Recommendation for 2018 Ford F-350 Super Duty
    The Demco UMS Underbed Rail Kit part # DM8551009 is a fit for your 2018 Ford F-350 long bed and will give you an underbed style of rails for a fifth wheel hitch. The UMS Fifth Wheel Hitch part # DM8550032 is a confirmed fit for this rail system so it would also work well. This hitch is compatible with a Mor Ryde pin box too.
    view full answer...
  • Differences Between Above and Under Bed Fifth Wheel Hitch Mounts for 2020 Ford F350
    There are two ways to install a fifth wheel hitch on a pick up truck. One would be to use standard bed-mounted rails. Brackets are mounted to the truck frame with the bed rails sitting directly above. Holes are drilled down through the truck bed to correspond with holes in the brackets bolted to the frame, allowing the bed rails to be securely bolted down. The rails have slots in them that allow the hitch to be installed and removed pretty conveniently. The problem here is that once the...
    view full answer...
  • Choosing Between the Demco Autoslide and B&W Companion for 2020 Ford F-250 without OEM Prep Package
    I can understand why a hitch like the Demco Hijacker Autoslide # DM8550022 (18k) or # DM8550037 (21k) is so attractive; they provide a much better solution for towing a 5th wheel with a short bed truck when it comes to not having to get in and out of the truck each time you need to make a tight turn. With that said, they're not compatible with B&W Turnoverball Underbed kits like the # BWGNRK1116-5W since the hitches connect to the underbed kit in two very different ways. In order to use...
    view full answer...
  • Comparing B&W Companion VS Demco Hijacker Autoslide 5TH Wheel Hitches For 2017 Ford F-250 6-1/2' Bed
    I recommend the Demco Hijacker Autoslide 5th Wheel Trailer Hitch # DM8550022 for your 2017 Ford F-250 with the 6-1/2' Bed. With having the Autoslide you will be able to maneuver your trailer in tighter spaces by being able to make a jackknife turn. Since it does not require you to unlock the hitch like many manual sliders to achieve this you will be able to make quicker turns in tight parking lots while on your trips. The Underbed Rail and Installation Kit # DM8551009 will allow you to...
    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
  • 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...
  • 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...
  • 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...
  • 5th Wheel Base Rails For Eaz-Lift Hitch or Underbed Rails & Sliding Demco Hitch For 2019 Ford F-250
    Thanks so much for the photos they were really helpful, and what I can tell you is that those are not OEM holes for the factory puck system on your 2019 Ford F-250; what it looks to be is that the previous owner had a gooseneck hitch that they removed. So you do have a couple of options, which are to get new above-bed base rails and install your current Eaz-Lift hitch, or go with the underbed rails and Demco sliding hitch. While I do see some rails in your photo, you will need new rails...
    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...
  • 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...
  • 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...
  • 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...
  • Can Demco Gooseneck Adapter # DM5988 be Used with Underbed Demco Rails DM8551009
    Since you have a set of Underbed Demco Rails part # DM8551009 installed in your truck you can use the gooseneck adapter part # DM5988 that you referenced.
    view full answer...
  • Underbed 5th Wheel Rail Mounting Systems for a 2017 Ford F-350 4WD With an 8 Foot Bed
    Yes, we do have some underbed mounting systems for your 2017 Ford F-350, but unfortunately there are no Reese 5th wheel hitch options rated for 26K. The only Reese hitch that fit with their Under-Bed Rail and Installation Kit # RP30126 was the Reese M5 20K # RP30921. Neither of which are a fit for your F-350. If you were wanting to stick with the below bed rails we have an option from B&W which is their Underbed Gooseneck Hitch # BWGNRK1116-5W along with the Companion # BWRVK3500-5W which...
    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...
  • How To Gain Vertical Clearance On A 5th Wheel Hitch And Pin Box That Is Hitting The Tailgate
    If you have your Trailair Flex Air 5th Wheel Pin Box - Lippert 1621 - 18K # LC328492 adjusted to its lowest position and the 5th wheel hitch is adjusted all the way up and you still don't have the necessary clearance, then you will need to look into a new 5th wheel hitch that will be compatible with your setup. The Demco Hijacker UMS Double Pivot 5th Wheel Hitch # DM8550033 fits your 2021 Ford F-350 if it has the factory puck system. This has a hitch height: 16" - 19", which is the tallest...
    view full answer...
  • Determining Pin Weight Of a 5TH Wheel Trailer When Adding Additional Cargo
    The only way adding 1718lbs of cargo to your 5th wheel would increase the hitch weight the same amount would be if you place all the weight directly over the hitch. Since this really isn't feasible you will not see your hitch weight increase that amount. To give yourself a rough estimate if your cargo weight is loaded half way between the hitch point and the axles then 50% of the weight is a rough calculation on the additional hitch weight. Do remember to add the weight of your 5TH Wheel...
    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 Dustin K
Video Edited:
Dustin K
Employee Chris R
Video Edited:
Chris R
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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