What Size Hole Do I Drill In Bed For B&W Gooseneck Turnover Ball In 2026 GMC Sierra 2500 ?

Updated 03/31/2026 | Published 03/27/2026

Question:

What size of hole do I need to drill on a 2026 gmc 2500 Denali for the goose neck hitch

asked by: Margaret M

Expert Reply:

Hey Margaret! Congrats on the truck, those are super nice! Little too much for my blood though haha.

In order to install the B&W Turnoverball Underbed Gooseneck Trailer Hitch w/ Custom Installation Kit - 30,000 lbs # BWGNRK1020 on your 2026 GMC 2500, you'd need to cut a 4" hole in the bed of the truck with a 4" hole saw. It helps to use a center punch after measuring where the circle will be; check out the installation video I've attached which shows this at the 3:30-4:20 mark.

Then for the safety loop in the bed, you'll drill 4 holes with an 11/16" drill bit. In the video he just uses one that is almost that size, then enlarges from the top with a step drill bit.

What type of trailer are you pulling with the truck?

expert reply by: Andrew N