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  1. 5th Wheel Hitch
  2. Demco
  3. OEM - GM
  4. Sliding Fifth Wheel
  5. 18000 lbs GTW
  6. Premium - Single-Hook Jaw
Demco Autoslide 5th Wheel Hitch w/ Slider - Single Jaw - Chevrolet/GMC Prep Package - 18K
Demco

Demco Autoslide 5th Wheel Hitch w/ Slider - Single Jaw - Chevrolet/GMC Prep Package - 18K

Part Number: DM79GV
In Stock
$2,002.87
Retail:$2,185.00
You Save: $182.13
5th Wheel Hitch

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This hitch slides automatically when you turn to give you 14" of clearance for tight turns. A wraparound jaw provides a smooth ride and a locking bar offers added security. Base secures in underbed mounts and removes for full bed access. 1-800-940-8924 to order Demco 5th wheel hitch part number DM79GV or order online at etrailer.com. Free expert support on all Demco products. Great prices and Fastest Shipping for Demco Autoslide 5th Wheel Hitch w/ Slider - Single Jaw - Chevrolet/GMC Prep Package - 18K. 5th Wheel Hitch reviews from real customers.
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Demco 5th Wheel Hitch - DM79GV

  • OEM - GM
  • Sliding Fifth Wheel
  • Demco
  • 18000 lbs GTW
  • Premium - Single-Hook Jaw
  • 18 - 19-1/2 Inch Tall
  • Double Pivot
  • 4500 lbs Vertical Load
  • 14 Inch Fore/Aft Travel

This hitch slides automatically when you turn to give you 14" of clearance for tight turns. A wraparound jaw provides a smooth ride and a locking bar offers added security. Base secures in underbed mounts and removes 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
  • 2 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
  • Fast, easy installation
    • Drops into the 4 receiver pucks that are built into your factory underbed rails
  • Made in the USA


Specs:

  • Application: 2020 and newer Chevrolet and GMC trucks with factory-installed towing prep package
    • 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: 18,000 lbs
  • Vertical load limit: 4,500 lbs
  • Travel: 14" front to back
  • Hitch height settings: 18" and 19-1/2"
  • 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 specially designed to fit in the underbed rails of your Ford Super Duty factory fifth-wheel towing prep package. 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 OEM tow package receivers, 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 puck receivers in your truck bed. Turn the handles to lock the feet into the pucks 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.



6077 Demco High Jacker Head Assembly for Auto Slide 5th Wheel Trailer Hitch - 18,000 lbs

6402 Demco High Jacker Adapter Plates for 5th Wheel Trailer Hitch - Chevrolet/GMC OEM

Installation Details DM79GV Installation instructionsAlternate Instructions DM79GV Installation instructions

This Product Fits The Following Vehicles




Customer Satisfaction Score:


Customer Reviews

Demco Autoslide 5th Wheel Hitch w/ Slider - Single Jaw - Chevrolet/GMC Prep Package - 18K - DM79GV

Average Customer Rating:  4.7 out of 5 stars   (625 Customer Reviews)

This hitch slides automatically when you turn to give you 14" of clearance for tight turns. A wraparound jaw provides a smooth ride and a locking bar offers added security. Base secures in underbed mounts and removes for full bed access.

by:

This product definitely gives me more availability for tighter turns that I was looking for. Second trip we took one of the pins popped out of the puck locking mechanism. Our last trip to Wyoming the spring pin that holds the head onto the frame was laying in my pick up box, bought a new spring pin clip that’s a little tighter, that seem to fix that issue. It would be good practice to go over the entire hitch of all mechanisms latches and secure pins before traveling. Seems with the moving and shaking, they may have a tendency to loosen a bit overtime.



by:

So far this hitch has performed well. I have a Mor Ride hitch and had to purchase the adapter plate. The hitch connects well to the adapter plate which eliminates me having to use the adjustable side bars. The hitch is heavy but sturdy. I would recommend this hitch to anyone looking for a hands free sliding hitch.



by:

Great hitch! Haven’t used it a lot but when I have it’s pretty easy to use



by:

I like the hitch the only down fall is the weight of it. When I need to remove it so I can use the back of the bed it not a 5 min job.



by:

This is an average of the Demco auto slide hitch purchase:
Purchase price: 5-stars. For the features and functionality of this hitch, the slight increase over a standard 5th wheel hitch is totally worth it.
Shipping: Nearly 2-stars but I'll say 3. 6-10 business days it says. Using the tracker eTrailer provides (which is nice) it showed the hitch arrived in the State over 2 weeks (business days) before I was finally contacted for delivery. I had to change my travel plans due to the delay. "TForce" has a "customer service" phone number that is never answered. I don't know if it's because I contacted eTrailer about trying to prod their shipper for my delivery or what.
Product: 4-stars. This thing is HEAVY! This makes the assembly a bit cumbersome, especially since the direction require a bit of interpretation. Not into English since it's made in the USA, but between instruction sheets. You'll need to place the base sideways on the pallet (I used a jack stand underneath) to be able to access the areas to install the lock nuts for the mount plates. The problem others may have is determining the proper height to mount these based on your hitch height and level of the trailer. I'd measure the ground height to your trailer tongue, then measure the same distance to your truck bed (ground to bed), then add remaining distance but add a few inches. Remember your truck will squat. This should give you an idea of which holes to use. The stabilizer bar that bolts to the tailgate end of the hitch has holes that are painted over, so don't give up if the threaded rods don't immediately screw in.
I also bought the hitch handling adapter so I can lift it into the bed of the truck with my tractor.
Functionally, this thing is great. So overall, the only drawbacks to a 5-star rating is the poor shipper and the less than stellar instructions.



by:
2023 GMC Sierra 3500

It's pretty heavy at 300 pounds. I had to rig a hoist so that I could install or remove from the truck. I installed the side plates first and had to adjust one of the locking tabs per the instructions. I installed the plates in the truck and then lifted the hitch assembly into place. After bolting hitch to the side plates, two of the locks on one side are too tight to remove. I'm going to drive around a bit before removing the whole assembly and adjusting the shims on one side.



by:
2024 GMC Sierra 3500

Bolted directly to GMC’s factory 5th wheel prep. Nice to have the auto slide feature. No need stop, unlock slide, move the truck forward, re-lock just to make a tighter turn.



by:
2023 GMC Sierra 2500

Exactly as ordered! Arrived a week early, and carrier even dragged it up the driveway for me. All parts present and zero damage. Install is straight forward, but man is this heavy!!!



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2024 Chevrolet Silverado 3500



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2022 Chevrolet Silverado 2500



by:

Worked out great. I used the hitch for my camper right after I installed it. However, I did break one of the bolts when installing it, which is OK. I just switched to grade 8 bolts which is better anyways. I love the fact that Demco hitch unlocks when you pull the lever regardless of weight on it. Compared to my previous Mopar hitch you had to get at the right weight pressure to unlock it.



by:

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:

Has to do a little assembly, really easy. Tows super nice, when turning does move towards the back. You’ll need to adjust the guides for the fifth wheel.



by:

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:

Love this hitch. While it is heavy it provides the stability and auto slide capability that I need to comfortably drive my 5th wheel thousands of miles. I have never had my 5th wheel contact my cab no matter how tight I turn.



by:

A very nice hitch. If you have a bed carpet or a bed liner it may require Un shimming the locking pins. I have a bed carpet and I had to stand on the back corners to get the pins to engage the bed pucks. Not really a big deal. It is very heavy so I assembled it in the bed of the truck. I would highly NOT recommend doing it this way except if you are by yourself. Get a chain hoist or maybe an engine hoist because it is very heavy as an assembled unit. It is flawless in its operation. Very well made. I am very happy with it.



by:

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



by:

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.



by:

I think that etrailer requires their employees to lie so as not to have any confrontations with customers on the phone. I placed two orders on 8/23 and immediately received followup emails that order received, order processed by (employee name) and then is in stock with associated time each step completed.
Then I noticed that shipping date kept getting 1 day later each day I checked order status. So, I contacted etrailer on day 5, 8/27 and find out my item was not in stock at all and would not be until mid Oct. Well,I then had them order me the same part by a different manufacturer and was told that it was in stock and would still be still be shipped 8/28 and delivered on 8/30, the same day my fifth wheel hitch is being delivered, so everything seemed rectified until I checked order status online the evening of 8/28 and find that the ship date again had been pushed back another day 8/29 with a delivery date of 9/1, (which is a Sunday). Seems that at this rate I may have it sometime in September. Going by their assurance of delivery on 8/30, I arranged to pickup my new camper on 9/5, that seems to be an impossibility at this time because Order #121389499 the installation kit with base rails is a very necessary part of the assembly. So, in closing I can only say that if you do not have the parts to ship, be honest and state the truth. This has made me feel very negative now toward etrailor as I already had become with Camping World. Is there any honesty in the RV parts aftermarket?


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  • Is Demco Slider Hitch DM79GV The Correct Fit for a Short Bed 2021 Chevy Silverado 2500 Puck System
    The Demco Autoslide 5th Wheel Hitch w/ Slider # DM79GV on our site is the exact same thing as the Demco part 8550061 you're referencing and it will fit the puck system on your 2021 Chevy Silverado 2500 short bed perfectly. Since we carry a wide variety of vendors we have to mix up the part numbers so that they are all unique since different companies will sometimes have the same part numbers.
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  • Does Demco Hijacker Autoslide Fifth Wheel Require Use of Adapter
    If you have a standard pin box you would not need to use any adapters with the Demco Autoslide Hijacker part # DM79GV. I can't tell you if you do or don't have one of the mentioned pin boxes on your fifth wheel as I don't have a way to know but if you go out and check your trailer's pin box you should be able to pretty easily tell.
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  • B&W Sliding 5th Wheel Hitch For 2021 Chevy Silverado 2500
    The B&W Patriot doesn't have an option to fit OEM puck systems, as its base is only for above-bed 5th wheel rails. It also won't work with puck adapters because the base of the Patriot (when it slides) will interfere with its adapters. So for a B&W sliding hitch on your 2021 Chevy Silverado 2500 you would need to go with the B&W Companion OEM 5th Wheel Hitch w/ Slider for Chevy/GMC Towing Prep Package # BWRVK3775. This does have a 20,000 lb capacity and you mentioned not needing that much,...
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  • Correct Demco Autoslide for 2024 GMC Sierra 2500
    The # DM8550034 is designed to fit industry standard rails so as is it will not fit your 2024 GMC Sierra 2500. You could get an adapter to add rails but that isn't necessary. What you need is the Demco Autoslide # DM79GV which comes with the Chevrolet/GMC OEM adapter plates. This will allow you to install it directly into your puck system.
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Info for this part was:

Employee Lindsey S
Edited by:
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Expert Research:
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Employee Dustin K
Video Edited:
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Employee Wilson B
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Employee Michael B
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