GM Puck System
The short answer: The Chevy Silverado HD and GMC Sierra HD share the exact same puck system (RPO Z6A). Here's the quick version — then jump to your brand's guide.
In This Guide
GM's Puck System, in One Minute
The Chevy Silverado HD and GMC Sierra HD are the same truck under different badges — and they share the exact same factory puck system. It's a five-hole setup (four corner pucks for a fifth wheel hitch plus a center hole for a gooseneck ball) that GM calls the Gooseneck/5th Wheel Prep Package, code Z6A. Here's the quick version — then jump to your brand.
Pick Your Truck
Same hardware, brand-specific guides
Which GM Trucks Have It?
HD only, and it's optional
Chevrolet
- • Silverado 2500HD
- • Silverado 3500HD
GMC
- • Sierra 2500HD
- • Sierra 3500HD
Important
The puck prep is an optional package (RPO Z6A) offered from about 2016 on — not every HD truck has it. Confirm your specific truck before buying a hitch. The half-ton 1500s don't offer it at all.
The One Thing Everyone Gets Wrong: The 2020 Change
Match the hitch to your year
GM redesigned the HD trucks for 2020 and moved the puck spacing in the process. The gooseneck ball still swaps freely between generations, but a puck-mount fifth wheel hitch's legs are year-specific — a 2016–2019 leg set won't fit a 2020+ truck, and vice versa. Whether you're in a Silverado or a Sierra, match the hitch to your exact model year.
What Hitches Fit?
Two ways to hook up
4-point fifth wheel hitch
The standard setup — four legs lock into the four corner pucks. B&W Companion OEM (GM version), CURT Q-Series with puck legs, and PullRite OE all make one. Match it to your year.
Single-point fifth wheel hitch
A single-point fifth wheel hitch (like the PullRite 3900) mounts to the center gooseneck ball and keeps your trailer's kingpin — one point of attachment instead of four.
Your brand's guide lists the specifics: Chevy or GMC.
Or jump to the best puck-mount fifth wheel hitches and how to install one.
Not Sure If You Have It — Or Don't?
Where to go next
Checking for pucks
Glovebox RPO label (look for Z6A) or five capped holes in the bed. Full walkthrough: Does My Truck Have the Prep Package?
No factory pucks?
You can't retrofit the factory prep, but rails or an under-bed kit work. See Rails vs. Pucks.
Related Guides
How Chevy's factory puck system works on Silverado 2500HD and 3500HD, what fifth wheel hitches fit, and the 2020 fitment change.
Read guide →How GMC's factory puck system works on Sierra 2500HD and 3500HD, how to install a gooseneck or fifth wheel hitch, and the 2020 fitment change.
Read guide →The puck-mount (OE) fifth wheel hitches worth buying — best overall, best value, best for short beds, and best heavy-duty.
Read guide →Ready to find your hitch?
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