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  1. Fifth Wheel Hitch
  2. Demco
  3. Sliding Fifth Wheel
  4. 21000 lbs GTW
  5. Aftermarket Below Bed Rails
  6. Double Pivot
Demco Autoslide 5th Wheel Trailer Hitch w/ Slider - Single Jaw - Underbed - 21,000 lbs

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

Item # DM8550037
Retail:$2,673.00
Our Price: $2,270.00
You Save: $403.00
Fifth Wheel Hitch
This item qualifies for Free Truck Freight Shipping
Shipping Weight: 332 lbs
Quantity: 
In Stock
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Product Expert Kathleen M

Is this right for you? Product Expert Kathleen M says:

Yes, if you:

  • Are a full-time RVer and don't use your truck bed for much else
  • Swap trailers with your friends and like being able to hook up without the need for extra capture plates
  • Have to make tight turns often and want to save yourself the hassle of getting out every time you need the hitch to slide

No, if you:

  • Have an eye for details and would be bothered by chipped paint that could eventually lead to rust
  • Plan on traveling on rough, uneven roads - the Autoslide's been known to bind in these conditions
  • Have a lifted truck and need a hitch that sits lower in the bed
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. Hitch removes easily for full bed access. 1-833-496-1390 to order Demco fifth wheel hitch part number DM8550037 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 - Underbed - 21,000 lbs. Fifth Wheel Hitch reviews from real customers.
  • All Info
  • Reviews (464)
  • Q & A (0)
  • Photos
  • Why etrailer?

Demco Fifth Wheel Hitch - DM8550037

  • Sliding Fifth Wheel
  • 21000 lbs GTW
  • Demco
  • Aftermarket Below Bed Rails
  • Double Pivot
  • Premium - Single-Hook Jaw
  • 15-1/2 - 18-1/4 Inch Tall
  • 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. Hitch removes easily for full bed access.


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
  • Rail-free design allows for full access to truck bed when hitch is removed
  • 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
  • Custom Demco underbed mounting kit (sold separately) required for installation
  • 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, 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: 15-1/2", 16-3/4", and 18-1/4"
  • 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, 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 specially designed to fit a Demco UMS custom underbed mounting kit (sold separately). 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 the receivers in your truck bed, 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 lower the hitch into the 4 UMS receivers in your truck bed. Turn the handles to lock the feet into the receivers and secure the handles with the included safety pins. The hitch can be removed to give you full truck bed access. Simply remove the safety pins, turn the handles to unlock the feet, and lift the hitch out of the receivers.


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" + 22" = 58". If your fifth-wheel trailer is 102" wide, take half (51"), then plug in: 58" - 51" = 7" 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

6004 Demco Hijacker Adapter Plates for Underbox Mount 5th Wheel Trailer Hitch

Installation Details DM8550037 Installation instructionsAlternate Instructions DM8550037 Installation instructions



Customer Satisfaction Score:


Customer Reviews

Demco Autoslide 5th Wheel Trailer Hitch w/ Slider - Single Jaw - Underbed - 21,000 lbs - DM8550037

Average Customer Rating:  4.7 out of 5 stars   (464 Customer 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. Hitch removes easily for full bed access.

by:

This hitch has been used daily since i purchased it. I deliver fifth wheel travel trailers all over the country. This hitch has worked flawlessly from day one. This hitch is one of the only products that I've ever bought that is exactly what it was described to be. Im not one to do reviews, so the fact that im doing this one , in itself, says a lot about the quality of your product. The design and looks are much better than any other hitch ive seen. It just looks better in the truck bed than others do.




by:

Instructions left alittle to interpretation when it came to hitch height in the bed of the truck. For a f350 super duty it is the medium set up. Save you some time and effort. Other then that it looks great and will be testing it out this weekend.




by:

Great hitch for a short bed truck thanks etrailer




by:

Hitch works great. Had some issues using it when I first got it with putting the pin to lock down the handle but its worked much better lately. The hitch is heavy so I leave it in the back of the truck. Wish I could remove it so it doesn't get weathered.




by:

Hitch sucks pain in the assembly to connect and disconnect.




by:

Hitch looks great and functions great as well. Installation could’ve been smoother due to the installation instruction measurements being slightly off. Look at finding hole caps that are 3” instead of two and drilling the larger hole.




by:

great hitch for my customers new truck to pull his new Durango 5th wheel!

Fast Delivery as well

Always RV
Mesa Az




by:

Great functional hitch. Poor powdercoating though (mostly flaking off) with quite a bit of rust after only a year.




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by:

Review from a similar Hijacker Autoslide in Fifth Wheel Hitch


This was the best solution for my Dodge RAM 2500 towing my Alliance 340RL 38' 5th Wheel. My son helped me install the rails under the bed and now it is very easy to remove the hitch when I am not using it. It is very strong and I highly recommend this for anyone with a short bed truck.




by:

Review from a similar Hijacker Autoslide in Fifth Wheel Hitch


Well built fifth wheel hitch. Haven't got a chance to tow our new Montana High Country 295RL. But I know a guy that has towed his fifth wheel with this same hitch. I'm sure this 18K hitch will be excellent! Or I wouldn't have bought it. I recommend e trailer for everything.




by:

Review from a similar Hijacker Autoslide in Fifth Wheel Hitch


wow what a great hitch . Got the no drill bed rails and the bolted rite up to my B&W gooseneck hitch . Ashley E did a great job answering all my questions . Only took a few days to get here too. Took me about 2 hours to install everything and if you have a short bed truck this is the only way to go .




by:

Review from a similar Hijacker Autoslide in Fifth Wheel Hitch


Demco auto slide hitch works very well with my crew cab short bed Ram. Fits under my tonneau cover nicely. Trouble free thus far. Had to purchase a Demco plate for the camper to make the Rhino box hitch work. etrailer personnel were great in helping ensure I had the right products and kept me well informed of shipping dates.




by:

Review from a similar Hijacker Autoslide in Fifth Wheel Hitch


Item works exactly as described. I have a shortbed (6.5') Ford F350. Probably towed our 5th wheeler 5000+ miles with no problem. Then last year it happened! We were making a sharp turn in an uneven lot and POW, the 5vr hit the rear window and it exploded. After that I became gun shy about turning with the 5vr attached so I started looking at sliding hitches. A slider that you had to get out and unlatch to make work, didn't make sense to me. At what point do you get out? So, an auto slider hitch was purchased. Now when I get to a certain degree turn the auto-slide hitch moves back in its carriage and then auto-slides to the normal location once straightened out. Not gun shy anymore.

Pro:
Well packaged
Well made
Easy install
It WORKS.

Cons:
Price
Very heavy
Some clunking after it straightens out from a turn


Comments
The hitch still works as described. Have not broken another rear window since installing it. I have learned that when unhooking from 5vr I have to take a pry bar to straighten out the hitch back to straight for rehooking. The only thing I do not like is the serious clunking that seems to occur when making some turns, then accelerating and the hitch straitening out. Thats the only real complaint I have. Since installation of the Demco I do not worry about making sharp turns!
Bugs B - 07/23/2021


by:

Review from a similar Hijacker Autoslide in Fifth Wheel Hitch


This hitch is great! It relieves you from any worries of making a mistake when turning or backing a 5th wheel trailer on sharp corners. You will hear a small metalic noise that is a result of the rotating head having clearances enough to operate properly and I had a similar sound with my bumper pull trailer.




by:

Review from a similar Hijacker Autoslide in Fifth Wheel Hitch


Best 5th wheel hitch ever for a RAM 3500 mega cab.
No issues with the RV coming close to the back of the cab or back glass.
I would recommend this hitch to anyone searching for a 5th wheel hitch for a Ram mega cab, I wish I knew about it when I first purchased my Ram mega cab, I learned the hard way, after busting out my back glass...and trying several hitches. This hitch is truly an autoslide. I have showed several short bed guys this hitch and told them the cost of the 5th wheel hitch is worth it.... It is top of the line. This will be the last 5th wheel hitch I will ever need to purchase.




by:

Review from a similar Hijacker Autoslide in Fifth Wheel Hitch


I have a 2017 Ford F-250 (Crew Cab, short box), and a 40’ 14,000lb 5th wheel. I’ve owned this Demco Autoslide for 1 year, and I absolutely love it. I purchased a 5th wheel for the maneuverability, but my expectations were blown away with this Autoslide. I also have the Extang Xceed hard tonneau cover, and when folded up (laying flat on the panel closest to the cab) I can maneuver however I want without removing the tonneau. If im going to make a really sharp turn on uneven ground I’ll stop and flip my tonneau all the way up, but very rarely do I have to do that. Also removal & install of this hitch is about as easy as removing & installing a 5th wheel hitch can possibly be. I use a rope, pulley, & my side by side. Highly recommend this Demco hitch.




by:

Review from a similar Hijacker Autoslide in Fifth Wheel Hitch


Love it works great


Comments
It works Great
Rod - 07/06/2022


by:

Review from a similar Hijacker Autoslide in Fifth Wheel Hitch


Very happy with my Demco Autoslide hitch after one year. We pull a Montana 3120 35 ft 5th wheel with a 2019 Ford F-350 short bed. Took a month long 6,000 mile trip from Colorado to New England/Canada this Summer. Lots of hilly/curvy roads and some remote campgrounds with tight corners and some near 80 degree back ins. Never came close to trailer contacting the truck. I’ve had no jerking or other issues when turning or stoping/starting. Works great. The only drawback is there isn’t much room for error when you back up to hook up the trailer, so it takes a little practice to get used to correctly lining up your Demco Hitch to the trailer. The first couple of trips, it took me 3 or 4 attempts to properly line it up. No longer an issue for me after a few trips and you get used to the angles. It weighs about 300 pounds. I got a small chain hoist which I installed in my garage rafters and easily lift the hitch in and out of my truck and just let it hang front he rafters until I need to use it.


Comments
One thing to consider - there are a lot of small springs and levers working inside the hitch head to work the king pin jaws. While this 5th wheel hitch is certainly robust and designed to take a beating from your 5th wheel when towing, it wasnt designed to support its own weight for extended periods of time.
-- Etrailer Expert Victoria B - 10/02/2019
Now been two years and have about 15,000 miles on my Demco Autoslide Hitch. Still works terrific with my 35 ft Montana on the F350 truck. Never a problem traveling or hitching up.
John T - 09/23/2020


by:

Review from a similar Hijacker Autoslide in Fifth Wheel Hitch


The Demco Auto slide takes the worry out of towing my fifth wheel trailer with a short bed F-350. I have had no problems with backing into tight camping spots. And since everything is automatic I have one less thing to worry about while traveling with a fifth wheel.
The only problem is that it is a little on the heavy side, so I just leave it in the truck when not towing. Problem solved.
I am extremely happy with the product.


Comments
For anyone else wondering how to use a MOR/ryde pin box with their Demco Hijacker Autoslide, you can use the Locking Plate # DM6025
Demco Autoslide Locking Plate for MOR/ryde Pin Boxes
$196.83
.
-- Etrailer Expert Victoria B - 10/07/2019
After over a year of towing with the Demco Auto slide I am very happy with its performance. Never a worry about tight turns with a short bed truck.
Raymond F - 09/27/2020


by:

Review from a similar Hijacker Autoslide in Fifth Wheel Hitch


We looked at several hitches and we decided on the Demco auto slider. The key was it’s an AUTO slider. I can say after a year I’m glad we bought one that is this tough as well. So many of the roads are under construction and this hitch is a beast. In my first couple of long-distance pulls, we ran into some very bad roads in need of repair, and even though we felt like we came out of our seats the hitch was steady and performed awesomely. That’s what you want!!!



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See what our Experts say about this Demco Fifth Wheel Hitch

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    It would actually be easier to back a trailer up with the Demco Hijacker Autoslide Fifth Wheel hitch # DM8550037 than a standard sliding fifth wheel hitch because you wouldn't have to get out and operate the slider when you came to a tight turn. The pivot point wouldn't make the way the trailer reacts much different. It wouldn't cause it to be unpredictable while backing.
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    The Demco Hijacker part # DM8550037 is ideal for the situations you described. Anytime you turn the truck sharply relative to the trailer the hitch slides back. The sharper the turn the further it goes back and as you straighten up it moves back forward. You basically would never have to worry about the slider mechanism as it takes care of itself. If you check out the review video I attached below you'll see a camera angle that captures how and when it slides.
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    The locking plate of the Demco Hijacker part # DM8550037 is something that installs onto the king pin of the trailer you will be towing to prevent the king pin from turning in the hitch head. The plate allows the head of the hitch to turn with the trailer which activates the slider portion of the hitch. It would only require the initial installation. I attached a page that has all of the locking plates we offer.
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    view full answer...
  • What Type of Fifth Wheel Hitch Can Install in Gooseneck Hitch in Bed of Truck
    The Demco Hijacker needs to attach to a standard set of fifth wheel rails. Since that's what you have then you could use a Curt Spyder adapter # 16085 and you'd be able to tow a gooseneck trailer.
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  • Will Demco Hijacker AutoSlide Fifth Wheel Hitch Allow 2016 Ram 3500 to Make Tight Turns when Towing
    The great thing about the Demco Hijacker Autoslide 5th Wheel Trailer Hitch # DM8550037 is that it slides automatically back 14 inches as you make tight turns. Because of that it would allow your 2016 Ram to make tight turns without interference, BUT since you have the factory rail kit you would want the # DM8550035 instead with the adapter part # DM6099. Both of these combined is 391 lbs but it is designed to be taken apart in sections to allow for an easier removal.
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  • 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...
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  • Correct Demco Hijacker Autoslide 5th Wheel Trailer Hitch For A 2017 Ford F-250
    The Demco Hijacker Autoslide 5th Wheel Hitch part # DM8550038 is specifically designed to fit Ford trucks that were equipped with the factory prep package and cannot be installed unless you have this package or have the dealer install it. I do however, have the same 5th wheel hitch in the Demco Hijacker Autoslide 5th Wheel Trailer Hitch part # DM8550037 that is compatible with your 2017 Ford F-250 Super Duty using the Demco Hijacker Premier Series Below-Bed Base Rails and Custom Installation...
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