Recommended 5th Wheel Hitch Rail Adapter for a 2026 GMC Sierra 2500 w/ the Factory Puck System

Updated 10/24/2026 | Published 10/23/2026

Products Featured in This Question

Curt A20 5th Wheel Hitch w/ S20 Slider for Chevy/GMC Prep Package - Dual Jaw - 20K

(1)

$1295.90

Adapter Rails for Curt 5th Wheel Hitch - Ford and Chevy/GMC Towing Prep Package

(756)

$476.95

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

(293)

$679.00

Question:

Hello, I bought a Curt slider fifth wheel from you with bolt in rails to the bed. I sold the truck with the rails. I have a new 2026 GMC 2500HD standard bed with the fifth wheel and gooseneck option. Do you make a set of rails for the old slider, that attach to the new fifth wheel holes already in the bed? Thank you

asked by: Robert H

Expert Reply:

We sure do Robert and congrats on your new truck! To use your Curt A16 sliding 5th wheel hitch with your Sierra's factory puck system, you'll need the Adapter Rails item # C88KR.

The Adapter Rails item # C88KR are going to connect directly to the four outer holes in the bed of your Sierra. This adapter provides a base that functions just like the 5th wheel rails you had in your old truck. Your Curt A16 hitch's slider base will then attach to the adapter. The item # C88KR adapter has a 25,000 lbs towing capacity so it will be plenty capable of working with your 16,000 lbs slider.

Please note that the Adapter Rails item # C88KR will add 3-1/2" of height to your 5th-wheel hitch when installed. If that big of a height increase is going to cause an unlevel connection with your trailer, we also have the Demco item # DM6333 adapter, which only adds 2-1/4" of additional height.

How are you enjoying your new truck and do you have any camping trips planned to break it in? Feel free to answer this and throw in any other questions you have, where it says Add Comment.