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2028 Ram 2500
Demco

Demco 5th Wheel Rail Adapter for Chevy/GMC OEM 5th Wheel Towing Prep Package - 21K

293 Reviews | 300 Questions
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$679.00
Retail:$799.00
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2028 Ram 2500

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demco accessories and parts adapters rail adapter dm6333
demco accessories and parts 5th wheel hitch rails rail adapter for chevy/gmc oem towing prep package - 21k
demco accessories and parts adapters dm6333
demco accessories and parts rail adapter dm6333
demco accessories and parts 5th wheel hitch rails adapters rail adapter for chevy/gmc oem towing prep package - 21k
demco accessories and parts 5th wheel hitch rails adapters
demco accessories and parts 5th wheel hitch rails rail adapter for chevy/gmc oem towing prep package - 21k
demco accessories and parts 5th wheel hitch rails
demco accessories and parts 5th wheel hitch rails rail adapter for chevy/gmc oem towing prep package - 21k
demco accessories and parts adapters rail adapter dm6333
demco accessories and parts adapters dm6333
demco accessories and parts adapters rail adapter
demco accessories and parts 5th wheel hitch rails
demco accessories and parts 5th wheel hitch rails rail adapter dm6333

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0 accessories and parts demco 5th wheel hitch rails rail adapter for chevy/gmc oem towing prep package - 21k
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Demco 5th Wheel Rail Adapter for Chevy/GMC OEM 5th Wheel Towing Prep Package - 21K customer photo
Demco 5th Wheel Rail Adapter for Chevy/GMC OEM 5th Wheel Towing Prep Package - 21K customer photo
Demco 5th Wheel Rail Adapter for Chevy/GMC OEM 5th Wheel Towing Prep Package - 21K customer photo
Demco 5th Wheel Rail Adapter for Chevy/GMC OEM 5th Wheel Towing Prep Package - 21K customer photo
Demco 5th Wheel Rail Adapter for Chevy/GMC OEM 5th Wheel Towing Prep Package - 21K customer photo
Demco 5th Wheel Rail Adapter for Chevy/GMC OEM 5th Wheel Towing Prep Package - 21K customer photo
Demco 5th Wheel Rail Adapter for Chevy/GMC OEM 5th Wheel Towing Prep Package - 21K customer photo
Demco 5th Wheel Rail Adapter for Chevy/GMC OEM 5th Wheel Towing Prep Package - 21K customer photo
Demco 5th Wheel Rail Adapter for Chevy/GMC OEM 5th Wheel Towing Prep Package - 21K customer photo
Demco 5th Wheel Rail Adapter for Chevy/GMC OEM 5th Wheel Towing Prep Package - 21K customer photo
Demco 5th Wheel Rail Adapter for Chevy/GMC OEM 5th Wheel Towing Prep Package - 21K customer photo
Demco 5th Wheel Rail Adapter for Chevy/GMC OEM 5th Wheel Towing Prep Package - 21K customer photo
Demco 5th Wheel Rail Adapter for Chevy/GMC OEM 5th Wheel Towing Prep Package - 21K customer photo
Demco 5th Wheel Rail Adapter for Chevy/GMC OEM 5th Wheel Towing Prep Package - 21K customer photo
Demco 5th Wheel Rail Adapter for Chevy/GMC OEM 5th Wheel Towing Prep Package - 21K customer photo
Demco 5th Wheel Rail Adapter for Chevy/GMC OEM 5th Wheel Towing Prep Package - 21K customer photo
Demco 5th Wheel Rail Adapter for Chevy/GMC OEM 5th Wheel Towing Prep Package - 21K customer photo
Demco 5th Wheel Rail Adapter for Chevy/GMC OEM 5th Wheel Towing Prep Package - 21K customer photo

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Use your standard, above-bed fifth-wheel trailer hitch with your Chevy or GMC factory, underbed 5th-wheel towing prep package. Adapter mounts in factory sockets and supplies mounting rails in your truck bed for attaching your hitch. 1-800-940-8924 to order Demco accessories and parts part number DM6333 or order online at etrailer.com. Free expert support on all Demco products. Great prices and Fastest Shipping for Demco 5th Wheel Rail Adapter for Chevy/GMC OEM 5th Wheel Towing Prep Package - 21K. Accessories and Parts reviews from real customers.
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Demco Accessories and Parts

  • 5th Wheel Hitch Rails
  • Adapters
  • Rail Adapter
  • Demco

Use your standard, above-bed fifth-wheel trailer hitch with your Chevy or GMC factory, underbed 5th-wheel towing prep package. Adapter mounts in factory sockets and supplies mounting rails in your truck bed for attaching your hitch.


Features:

  • Converts your factory-installed, underbed 5th-wheel mounting kit from Chevy or GMC to standard, above-bed 5th-wheel base rails
    • Lets you use your 5th-wheel trailer hitch that attaches to standard, above-bed rails
  • Mounts to OEM pucks (or sockets) in your truck bed
    • Unit drops into pucks and locks in place
    • No drilling or welding required
  • Rust-resistant black powder coated steel construction
  • Made in the USA


Specs:

  • Application: Chevy or GMC trucks with OEM, underbed base rails and 6-1/2' or 8' beds
  • Maximum capacity: 21,000 lbs
  • 5-Year warranty


Note: This adapter will not work with a B and W Patriot sliding hitch.


This adapter is perfect if you want to use your standard fifth-wheel trailer hitch with your Chevy or GMC truck's factory-installed, underbed fifth-wheel mounting kit. Just mount the adapter in your underbed rails using the integrated pucks and lock it place. Now you have the standard, above-bed base rails needed to install your fifth-wheel hitch.



6333 Demco Chevy or GMC Truck OEM Adapter for Attaching Standard Fifth-Wheel Trailer Hitches

Item # DM6333

Installation Details DM6333 Installation instructions

This Product Fits The Following Vehicles






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Customer Satisfaction Score:

Ratings & Reviews

4.7

293 reviews
5 Stars
(248)
4 Stars
(30)
3 Stars
(6)
2 Stars
(4)
1 Star
(5)
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by:
Took me less than two hours to install by myself (heavy)....and it dawned on me which sets of bolts needed to be loosened up to allow the device to seat EASILY into the pucs. Fits my 5th wheel setup perfectly!
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Lazer S. profile picture
Etrailer Expert

Lazer S.

3/10/2026

Glad it wasn't too difficult! Even with it being as heavy as it is. What kind of hitch are you using this with?

Guzziguy profile picture

Guzziguy

3/10/2026

@LazerS ... Trailer Saver BD3
by:
Package arrived mangled, barely able to get it out of the delivery truck without it falling out of the packaging. In the end, no harm done, contents were not damaged.

Bought for use on a 2024 Chevy 2500 HD with factory installed pucks. Mounted a PullRite model #2700 slider fifth wheel hitch on top of the adapter. Adapter is very heavy duty and well designed. Per the instructions I loosened all of the latch bolts prior to installation into the truck. Retorqed once everything was in place. Simple, took less than 30 minutes. Then reinstalled my PullRite hitch without any issues.

Adapter seems well made and rock solid. Will have to wait until I tow again to see how everything rides. The height of the installment measures roughly 1.5-2 inches higher than before.

Ordering was a breeze, arrived in less than 3 days. Mike was very helpful throughout the process.
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Vince profile picture

Vince

7/4/2025

After a year of operating with this product, I give it 5 stars. Well made, simple to remove and reinstall when you need your truck bed, and it actually provided the perfect amount of extra height to refine the fifth wheel assembly. No chunking or excess noise while towing. Highly recommend for those needing such a rig.

Kate F. profile picture
Etrailer Expert

Kate F.

7/7/2025

@Vince Thank you for taking the time for such a detailed review. I am glad you went from a 4 star to a 5! I will definitely be keeping in mind the lack of clunking for my recommendations. What has been your favorite camping experience with the new hitch? Where did you go?
by:
bought a new truck that uses the "puck" system. currently have the Demco Autoslider bed rail hitch. Didnt want to but a new hitch. this adapter was the perfect solution.20minuts to install and set the puck clamps to the proper depth/tension. Highly recommend Demco and etrailer.
by:
Built just like the rails I had in my old truck. I actually had the Curt adapter plate before this one and had to return it because it added too much height to my hitch. This one saved me a half inch and hopefully the $[XX] bed cover I purchased will work now.
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Matthew profile picture

Matthew

4/22/2025

The adapter plate has held up really good after a year. We tow a 12k fifth-wheel once a month and travel anywhere from 5 to 600 miles per trip. Great product.

Jon G. profile picture
Etrailer Expert

Jon G.

5/6/2025

@Matthew This is great feedback, thank you! What's your favorite trip you've taken so far?
by:


This adapter allowed me to use the Curt A16 hitch I already owned. This DEMCO 6333 adapter is an absolute monster. Incredibly well built with precise machining. The hitch fits very well.
Since each truck is built within a certain tolerance and slightly different I had to make a minor adjustment to the lock down positions to get the perfect fit. By loosening all 4 bolts on each of the lock down handles I was able to get the adapter to drop right in place.
Comparing this adapter to others is no comparison.
This DEMCO 6333 is much sturdier.
I added a picture of the Curt A16 mounted on the DEMCO 6333 under the LUND Tri-fold cover. Overall, this is a great combination.
I wanted to be sure to say "THANKS" to Montrell (etrailer Rep) who ensured the DEMCO was a proper fir for my truck as well as processing the order quickly. Job Well Done!!
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John profile picture

John

4/25/2022

Its been a year and about 5,000 miles. Overall The Demco works well. I dont like noisy, clunking fifth wheel hitches. With some shim adjustments I am able to keep the Demco plate snug in the built-in GM adapter.

by:
Very easy install and super fast delivery. Unit is heavy duty without being too unmanageable to handle. Very well made. Going to feel very secure going down the road.
James profile picture

James

12/7/2025

Still very happy with this adapter one year out. No problems at all.

by:
Dodge Ram Pickup
This is an excellent product to use for the Demco auto slider 5th wheel. Follow the directions and it will drop right into the pucks. It's heavy so it will take another pair of hands unless you're Arnold. I'm alone, so I have a 2 ton engine hoist that works real well. My auto slider drops right into adapter rails. An excellent piece of equipment from etrailer. Best place to buy rv equipment. When needed, they're an excellent choice for advice. I might add that this adapter is only for the 2020 Silverado and GMC Sierra. They have different ones for Ford and Ram. I would definitely buy from etrailer again.
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by:
I got a new 2021 GMC with the puck system and I wanted to be able to use my existing Pullrite Superglide 2700 hitch. I looked at the Pullrite adapter...that's a multi-piece rail system and was thinking more likely to rattle. Found this Demco adapter which is one piece and a better price.

Just put the adapter (and the hitch) in the truck this morning. Following the instructions, loosened the bolts and it dropped right in. The only thing that would've made this better is if the temp was above freezing.
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by:
Outstanding product. But even more outstanding was Customer Service and expert technical advice. All questions to the technical experts were processed fast and right on with correct answers. Customer service was unbelievable. I called them with a concern on shipment that was being held up. They got right in it and before the evening was gone my shipment was. Processed and at my house in three days. I was in a bind to move my fifth wheel and without a working hitch in my new truck. They came through with the product and shipment so I could move my camper and not have any issues.
As others have said, etrailer is above others on customer service and reliability of product and great technical help. My choice of business when I need something or have to have the correct technical data.
Thanks for the extra effort.
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by:
2020 Chevrolet Silverado 3500
Just had to make a small adjustment to fit the puck system but in the end, fit perfectly and seems fairly tight. My Reese slider hitch fit perfectly.
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by:
Excellent product, I bought a 2020 GMC diesel the rail adapter fit perfect. As you can see in the picture, a husky fifth wheel hitch fit this adapter. The instructions that come with the adapter made it easy to install.
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by:
Excellent service, was able to ship my item to me in 3 days!!! Will always refer friends and family to etrailer! The Demco 6333 fit my 2020 Denali dually perfect so I could keep my 5th wheel hitch...
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by:
2020 Chevrolet Silverado 3500
I love the adapter. Received it really fast, and it dropped in and fit really well. I have a 2020 Chevrolet Silverado 3500hd, with fifth wheel prep package. I also have a Curt E16, with A16 slider to use on it.
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by:
It fits the new 2020 Gmc / Chevrolet
And has two different sized hitch connections for US standard hitches you got to loosen up where the handles are with a wrench set it down make sure they lineup and then tighten it down and snap it in
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by:
2020 Chevrolet Silverado 3500
Product is very well built. Installation would have went much quicker had there been directions explaining to loosen the 4 9/16 bolts at each handle to allow play for the adapter to fall into pick system. Then retighten bolts. What should have taken 10 minutes took over an hour and reading others reveiws.
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by:
Excellent! 5 minute install!!
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by:
Just received the adapter and 15 minutes to install. However, you likely will have to loosen the 9/16 bolts on one side to get it to drop into the puck holes then torque back down. Mine was just a 1/32 off and would not drop until I loosened the bolts which allowed the locking tabs to drop into the puck.
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by:
To be honest, I wish I had gotten an 8' bed on my new truck so I wouldn't need to get a sliding hitch. It's very heavy! You have to have an engine lift to put it in and that's not very easy to do either. The arm isn't long enough so you will have to move the hitch around by hand after you hoist it up into the bed. Very heavy! But, if you have a short bed truck it's the only hitch to get to protect your cab.
Katrina D. profile picture
Etrailer Expert

Katrina D.

2/16/2024

Oh yeah, sliding hitches are way heavy! I always make sure to use a second person to help carry just half of one. It's definitely worth the weight though, your truck will thank you. We use a forklift sometimes to help us lift one to the bed of a truck.

Kevin profile picture

Kevin

2/12/2025

Nothing changed other than I purchased a center hook to lift the hitch out of the base rail. It helps

Bryce D. profile picture
Etrailer Expert

Bryce D.

2/12/2025

@Kevin Glad to hear it!
by:
2024 GMC Sierra 2500
Does NOT fit my Hijacker "Ultra Slide" as recommended by the professional chat [at] etrailer.com. The slots and holes do not line up and are to narrow. Will be returning.
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by:
The adapter fit my 2020 GMC 3500 like a glove just like Korren said it would.I ordered it on a Thursday and got it the following Tuesday.
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by:
I have had Reese adapters for Ford and Ram and the Demco is by far the best built for ease of engagement and adjustment there is. Great job DEMCO!!
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by:
Easy installation.
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by:
Chevrolet Silverado
First time using etrailer. The whole process from ordering to delivery was great, placed order on Tuesday and received it on Thursday. I was kept informed through the entire process. I ordered the Demco dm6333 adapter to be used with a Pullrite 2700 SuperGlide that i already owned. Used the dm6333 adapter in a standard bed 2020 Silverado 2500 that had factory pucks. Had to loosen the bolts on the locking handle plates to get the adapter to drop in the pucks but that was expected from posts I saw on line, no problem. Mounted 2700 SuperGlide to adapter just fine. Trailer is 7 inches above bedrails and good clearance when turning. Trailer is about 2 inches from level but I don't think that is a problem. Demco's dm 6333 seems to be what i needed without having to purchase a new hitch.
Dennis profile picture

Dennis

2/3/2022

After a year, still pleased with the Demco dm6333 hitch adapter, works for me.

by:
Thank you and the product is everything I was looking for. All aspects of the service was great . Again Thank you
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Scott profile picture

Scott

6/6/2021

I installed it and walked away with no issues- highly recommended

by:
2024 Chevrolet Silverado 2500
Outstanding product, fast shipping and excellent customer service by Amy!!!!
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Condition: Surface Scratches

Notes: Item has cosmetic scratches and paint chips along the edges. Otherwise new and unused.

$556.22
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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 Jacob H
Installed by:
Jacob H
Employee Dustin K
Video Edited:
Dustin K
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