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  1. 5th Wheel Hitch
  2. Demco
  3. 21000 lbs GTW
  4. Above Bed Rails
  5. Sliding Fifth Wheel
  6. Premium - Single-Hook Jaw
Demco Autoslide 5th Wheel Trailer Hitch w/ Slider - Single Jaw - Above Bed - 21,000 lbs
Demco

Demco Autoslide 5th Wheel Trailer Hitch w/ Slider - Single Jaw - Above Bed - 21,000 lbs

Part Number: DM8550035
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$2,050.00
Retail:$2,455.00
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5th Wheel Hitch
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This hitch slides automatically as you drive to give you 14" of additional clearance for tight turns. A wraparound jaw provides a smooth ride and a locking bar offers added security. Pivoting head allows easy hook up and helps to limit chucking. 1-800-940-8924 to order Demco 5th wheel hitch part number DM8550035 or order online at etrailer.com. Free expert support on all Demco products. Great prices and Fastest Shipping for Demco Autoslide 5th Wheel Trailer Hitch w/ Slider - Single Jaw - Above Bed - 21,000 lbs. 5th Wheel Hitch reviews from real customers.
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Demco 5th Wheel Hitch - DM8550035

  • 21000 lbs GTW
  • Above Bed Rails
  • Demco
  • Sliding Fifth Wheel
  • Premium - Single-Hook Jaw
  • 15-1/4 - 18 Inch Tall
  • Double Pivot
  • 5250 lbs Vertical Load
  • 14 Inch Fore/Aft Travel

This hitch slides automatically as you drive to give you 14" of additional clearance for tight turns. A wraparound jaw provides a smooth ride and a locking bar offers added security. Pivoting head allows easy hook up and helps to limit chucking.


Features:

  • 5th-Wheel hitch mounts in your short-bed truck bed so you can tow your 5th-wheel trailer
  • Automatic slider provides clearance required for your short-bed pickup to turn safely at slow speeds
    • No more getting into and out of the truck to operate a manual slider
    • Head slides toward the tailgate when you turn and back toward the cab when you straighten out
    • Rack-and-pinion gears create smooth, controlled, automatic motion
  • Rotating hitch head turns up to 90 degrees with your trailer
    • Rotation creates the force that propels the automatic slider
    • Built-in brackets stabilize your pin box so the king pin won't rotate in the hitch - no need for a separate capture plate for standard pin boxes
  • Wraparound, single-piece jaw provides a secure connection
    • 360-Degree jaw-to-king-pin contact
    • Less rattle and more security than slide-bar jaws
  • 3/4" Thick, solid steel locking bar reinforces the connection of your coupled trailer
    • Automatically locks into place when the jaw closes
  • Double-pivot hitch head eases hookup and helps to limit chucking
    • Pivots front to back and side to side
  • 3 Height settings to fit your application
  • Cushioning polyurethane dampeners help reduce noise and absorb road shock
  • Spring-loaded handle with comfort grip allows for simple coupling
    • Tethered safety pin lets you secure the handle in the open or the closed position
  • Sturdy steel construction with rust-resistant black powder coat finish
    • Diamond-plate tread on hitch base adds unique styling
  • Simple installation with base rails and installation kit (sold separately)
    • Compatible with B&W, Curt, Demco, Draw-Tite, Hidden Hitch, Husky, Reese, and Valley above-bed base rails
    • Cannot be used with rails that are a part of a gooseneck adapter plate - base rails must be securely bolted to your truck
  • Made in the USA


Specs:

  • Designed for use on 6-1/2' truck beds
  • Fits standard pin boxes 12" - 14" wide
    • Locking plates (sold separately) are required for use with Glide Ride, Mor Ryde, Trailair Tri Glide, Trailair Flexair, Rota Flex, Lippert Road Armor, and 5th Airborne pin boxes
  • Gross towing weight: 21,000 lbs
  • Vertical load limit: 5,250 lbs
  • Travel: 14" front to back
  • Hitch height settings: 15-1/4", 16-1/2", and 18"
  • 5-Year limited warranty


Note: This fifth-wheel trailer hitch is not compatible with Sidewinder or Revolution king pins. Do not use any device that changes the pivot point of your trailer's king pin with this hitch.


Automatic Slider Makes Cornering Easy

Most often used on trucks with 6-1/2' beds, a slider helps to eliminate clearance problems during slow-speed turns. When you are towing a fifth-wheel trailer, your hitch must be situated on the cab side of your truck's rear axle. However, at slow speeds you can use a slider to slide the fifth-wheel hitch (and the trailer) toward your truck's tailgate and past the rear axle, creating enough space between the cab of your truck and the trailer to permit less-restricted turning.


Normally, you'd have to get out of your truck and pull a lever to release the slider before every turn, but what if there was an automatic system? Imagine having 14" of extra clearance while towing your fifth-wheel trailer. Now imagine having this without needing get out of the truck to move your slider. The Demco Autoslide makes this fantasy a reality. The Autoslide automatically glides back smoothly when you make a sharp turn so you can maneuver effortlessly around tight corners within campsites and parking lots.


Demco Hijacker Autoslide

The base of the Autoslide has a built-in rack-and-pinion gear system that operates automatically. As your truck turns, the pinion in the base also turns. This activates the rack gear, which causes the rotational force of the truck to be converted into the linear sliding action of the hitch. So, when your truck makes a sharp, slow-speed turn, the gears inside the Autoslide force the hitch head to slide down toward your truck's tailgate in a smooth, controlled motion. This way, any time that your truck turns more than 10 to 15 degrees, the Autoslide will ensure that there is enough clearance for your trailer to complete the turn as well, and it will do so without any jerking or binding.


In order for the rack-and-pinion assembly to function as designed, the pin box must be stabilized on the hitch head. Normally in a fifth-wheel hitch, the king pin moves inside of the hitch head so that the trailer can turn. With the Autoslide, the king pin remains fixed inside of the jaws of the hitch and it is the hitch head itself that turns. This is thanks to the capture brackets on the sides of the head that brace the pin box from both sides to hold it in place on top of the hitch head. This is done to ensure that there is enough resistance within the hitch when your truck turns to properly activate the rack-and-pinion gear mechanism.


Demco Hijacker Autoslide capture bracket

To stabilize your pin box on the hitch head, simply push the capture brackets up against your pin box once the trailer is coupled and tighten the outer bolts and the inner jam nuts. The Autoslide head and brackets will fit standard pin boxes that are between 12" and 14" wide. If you have a Glide Ride, Mor Ryde, Trailair Tri Glide, Rota Flex, Lippert Road Armor, or 5th Airborne pin box, you must install a special locking plate (sold separately) as well.


When you straighten your rig out again and your trailer moves back in line, the hitch head will rotate back to center and slide back toward the cab into the straight towing position.


Secure Wraparound Jaw with Locking Bar

Demco Hijacker Autoslide wraparound jaw and locking bar

The single-piece, strong wraparound jaw completely surrounds your trailer's king pin for 360 degrees of contact. This wraparound jaw provides a more secure connection than standard 2-piece jaws that close in on the king pin from the sides. The increased jaw-to-king-pin contact on the Autoslide offers tighter tolerances around the king pin, which minimizes both rattle and chucking, for a smooth, quiet ride.


A 3/4" solid steel locking bar spans the area in front of the jaw. This bar provides an added barrier of protection against accidental disconnection so you can have peace of mind that your trailer is secure. The locking bar is attached to the jaw and to the spring-loaded handle. The bar automatically locks when the jaw closes around your king pin.


Double-Pivot, Cushioned Hitch Head

The double pivoting, cushioned head improves your towing experience dramatically by helping to reduce jarring and unwanted noise. Built-in pins allow the hitch head to pivot back and forth and side to side. And hooking up is easy because the hitch head will automatically pivot to the proper angle when it comes into contact with your pin box.


Three polyurethane dampeners help to cushion the movement from the pivoting head and to reduce towing noise. Two of these dampeners are built into the head assembly to cushion the head's side-to-side pivoting. The third dampener cushions the back-and-forth motion and must be installed in the hitch prior to use. Installation of this third dampener is easy - simply press the dampener up into the pre-drilled hole underneath the hitch head.


Easy Installation

The Autoslide hitch is designed to attach to universal above-bed base rails (sold separately) . The hitch will fit most industry-standard rails, including those from B&W, Curt, Demco, Draw-Tite, Hidden Hitch, Husky, Reese, and Valley. The hitch comes pre-assembled for an easy installation. All you have to do is bolt on the side plates and attach the head to the hitch base.


The side plates have 2 functions. They contain the feet that fit into your above-bed rails, and they allow you to raise or lower the hitch head to better match your pin box height. After you choose your desired height setting, simply bolt the side plates to the hitch base with the included hardware. Then attach the base to the rails with the included safety pins.


Clearance Formula for Short Bed Trucks

Use the formula below to ensure there will be enough space between your truck cab and trailer when executing a 90-degree turn.


(A+B) - C = Clearance


A = Distance from the center of fifth-wheel hitch jaw to truck cab

B = Length of Travel (14")

C = Width of trailer divided by 2 (to get half)


For example: If the distance from the center of the hitch to the cab is 36", 36" + 14" = 50". If your fifth-wheel trailer is 84" wide, take half (42"), then plug in: 50" - 42" = 8" of clearance.


Note: At least 4 inches of clearance is recommended to safely execute a 90-degree turn.



6107 Demco Hijacker Head Assembly for Auto Slide 5th Wheel Trailer Hitch - 21,000 lbs

6003 Demco Hijacker Adapter Plates for Auto Slide 5th Wheel Trailer Hitch

Installation Details DM8550035 Installation instructionsAlternate Instructions DM8550035 Installation instructions


California residents: click here


Customer Satisfaction Score:

Ratings & Reviews

4.7

668 reviews
This hitch slides automatically as you drive to give you 14" of additional clearance for tight turns. A wraparound jaw provides a smooth ride and a locking bar offers added security. Pivoting head allows easy hook up and helps to limit chucking.

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Show More Reviews

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

  • Troubleshooting Demco Hijacker Autoslide Making Noise
    How old is the hitch? Does your fifth wheel have a standard pin box or a cushioned pin box? Has it been lubricated? Does the locking bar automatically lock when the jaw closes? The thing that comes to mind immediately is the capture plates may not be adjusted properly. They MUST be evenly on both sides to 1/8" more than the width of the pin box.
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  • 2500 or 3500 Series Truck Recommendation for Towing Trailer 14,500 lb
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    I can help you figure out how to get more turning clearance with your short bed truck. Due to the style of the Atwood pin box you have on your trailer the Sidewinder is not recommended to be used. An alternative to this would be a sliding hitch. A sliding hitch will give you turning clearance for your trailer just not the 90 degrees that the Sidewinder provides. I really like the Demco Hijacker AutoSlide's, # DM8550035, technology because you never have to get in or out of your bed...
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    Hey Joe, Does your Bradford flatbed have a recessed gooseneck hitch already installed or is it just the flat bed right now? If not, you're going to need to cut out space for a gooseneck hitch like the B&W # BWGNRK1500 to be installed. From there you would need a 5th wheel hitch that mounts to a gooseneck ball like B&W's flat bed hitch # BWRVK3050. The bed height for a flatbed is typically a lot higher than a standard bed so a shorter hitch is typically going to be required so that the...
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  • Will Andersen Ultimate Allow a 90 Degree Turn When Towing with a 2017 Ram 2500 6-1/2 Bed
    The Andersen Ultimate Connection # AM3200 has a 9" offset. I am not sure if it will allow you to make 90 degree turns with your 2017 Ram 2500 6-1/2' bed but this can simply be determined by measuring from the back of your cab to the middle of the space in-between your base rails (or the pucks). Once you know that simply add 9" for the offset and the subtract half of the width of your trailer. The formula looks likes this: (A + B) - C = Clearance A = Distance from center of fifth wheel...
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    Thanks for reaching out! The 22K Reese 5th Wheel Trailer Hitch RP30033 might work with the 6-1/2' bed on your 2017 GMC Sierra 2500 but we need to do a little math first. Here is the formula we need to use: (A + B) - C = Clearance A = Distance from center of fifth wheel hitch jaw to truck cab - (Just measure from the middle of in-between your base rails to the cab) B = Length of slider/offset/Sidewinder - (This would be 0 for you) C = Width of trailer divided by 2 (to get half) - (This...
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    For your Demco Hijacker Autoslide, if you have the above bed rail version like the 18K # DM8550034 or the 21K # DM8550035, then you will be able to use the adapter for your factory puck system. This adapter for your 2017 Ford F-250 is the Reese Elite Series Underbed Rail Adapter for Standard 5th Wheel Trailer Hitches - 20,000 lbs # RP30156. If you want the hitch that will fit without an adapter, the # DM8550038 or # DM8550024 would be the options. You may also want to consider using...
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  • Fifth Wheel Hitch Recommendation for 2018 Ram 3500 Short bed With Rail Kit
    The 2018 Ram 3500 duallys have pretty high towing capacities. But from the research I did on your truck in order for you to have a higher capacity than 21k like you'd need you'll need to have a the Cummins diesel engine and at least the 3.73 gear ratio.
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    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...
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    Since your 2015 GMC 2500 has the 6-1/2 foot bed you will want to go with a sliding 5th wheel hitch. There are a couple of different options that you can go with here. If you are wanting to go with a 5th wheel hitch that uses the standard base rails then I recommend going with the Curt A20 # C16541 along with Base Rails Kit # RP50066-58. This 5th wheel hitch is one of the best hitches that we currently carry due to the dual-jaw system and the pivoting head to help secure the king pin and...
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  • Best Automatic Sliding Hitch Recommendation for 2012 Ram 3500 Short Bed with Above Bed Rails
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  • Is a Wedge Available for a Trailair Pin Box to Use with the Demco Hijacker Autoslide 5th Wheel Hitch
    Although there are some wedges that Demco offers to use in conjunction with the Demco Hijacker Autoslide, like part # DM8550035, the wedges are made for specific specialty pin boxes and won't work with a standard pin box. For a standard pin box you need to use the capture brackets that already come with your 5th wheel hitch. If you want to upgrade your pin box to one that uses an air bag or shock to help enhance your towing experience just let me know what your pin box number is (like...
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  • Parts Needed To Install Demco Autoslide 21K Hitch In a 2024 Ford F-350
    Sorry Frank, I'm a little confused and think you may have put in the wrong number as I do not see anything coming up as a Demco 6170. If you are referring to the Head and Base Assembly # DM6107 then yes you will be able to install this into your 2024 Ford F-350. You will need either the Rail Kit # DM72GV along with the Side Plates # DM6003 if your truck did not come with the factory in bed connections. If you have the factory in bed mounting holes we have the Ford Side Plates # DM6033 that...
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  • Adapting Demco Autoslide 5TH Wheel Hitch To Fit Factory Prep/Puck Bed On a 2023 GMC Sierra 2500
    You have a couple options for moving your Demco Autoslide 5th Wheel Trailer Hitch # DM8550035 to your 2023 GMC Sierra 2500 with the factory in bed prep/puck system. First the best way in my opinion is to remove the mounting brackets on the side of your hitch and add the Side Plates # DM49GV. These will allow you to set the hitch into the factory mounts on your Sierra. The other option is using a Demco 5th Wheel Rail Adapter # DM6333 to act as an adapter between your bed mounts and your...
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  • Does Demco Rail Kit Require Drilling Truck Frame When Installing On 2016 Chevrolet Silverado
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