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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.
Features:
Specs:
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.
California residents: click here
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.
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.
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
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.
2/12/2025
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.
Great customer service! Called to verify if this would work in my new GMC 2500, along with my previous demco hitch. Fit like a glove! Fast shipping. Always happy with E-Trailer! Thanks guys!
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.
Very easy installation. It’s nice having 4 anchor points instead of just one like the older style.
Looks like a well built product, haven’t had a chance to put it in the truck yet but the hitch fits in it. Only issue is the package is not great and the paint is all chipped off on the corners
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!!
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.
Very well built. This holds my Husky slider hitch perfectly. The slider operates as designed.
Unlike some other brands of adaptors on the market.
Still adds about 2"more to the installed height of my hitch compared to old style standard bed rails.
The rail adapter fit into GMC 2025 HD great. My Pull Rite hitch drop right in.
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.
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.
I'm so glad we found your product, which works well for our 5th wheel hitch. Saved us from having to buy a new hitch.
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.
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.
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.
This product was poorly shipped. The corners weren’t protected should put in hard pieces of cardboard elbows on the corners. I will show you pictures. THIS IS NOT NOW A PROTECTED ITEM FROM RUST. I WAS GOING TO CONTACT YOU TO SEE HOW TO FIX THIS. I will be waiting for a call
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.
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.
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...
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.
This is the 3 rd 5th wheel hitch I’ve ordered from you over 8 year period air bags shocks alway top quality and service is second to non!
Quick delivery, I've always had good luck over the years with etrailer and I would recommend them to anyone!! the Box was severely damaged but merchandise in good condition. I blame UPS as for the package was extremely heavy..
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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Condition: Surface Scratches
Notes: Item has cosmetic scratches and paint chips. Otherwise new and unused.
Info for this part was:
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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.