GM Side Bed Cargo Boxes with Tonneau Cover

Fuel Guy · September 23, 2021

New to this forum, and just purchased a 2021 GMC 3500 HD Denali Crew cab, along with the GM Side Bed Cargo Boxes. Problem being is the truck also has a tonneau cover, and the boxes dont fit with the clamps of the tonneau cover? Hard to imagine a company like this would design and put their name on these cargo boxes, (yes gm part numbers) and no one ever thought about the whole concept of these boxes in use with a tonneau cover? I am wondering if anyone else has come across this problem, and what did they to do fix it?

Thanks

November 8, 2021

LOL, I bought the GM Dash Cam system with OBD integrated harness. It threw all kinds of codes- air bag, abs, blocked ONSTAR. The minute I unplugged it everything came back to normal. GM doesn't care or make any accessories- "branded third party products".

GMC4Zee · November 12, 2021

Fuel guy, you might just try a different fastener for the rails If your going to keep the truck then maybe drill holes and use short screws and nuts or maybe pop rivets every foot or so. I have a cover and know that the clamps are large. Just giving you options. The rails are never removed unless you are getting a new cover or removing it for sale so why not make it permanent.

Fuel Guy · November 12, 2021

Thanks for the reply, and that is exactly what I did. If and when I sell the truck, I can only assume the tonneau cover and tool boxes will stay with it. Be Safe.

newdude · November 12, 2021

On 9/23/2021 at 10:48 AM, Fuel Guy said:

New to this forum, and just purchased a 2021 GMC 3500 HD Denali Crew cab, along with the GM Side Bed Cargo Boxes. Problem being is the truck also has a tonneau cover, and the boxes dont fit with the clamps of the tonneau cover? Hard to imagine a company like this would design and put their name on these cargo boxes, (yes gm part numbers) and no one ever thought about the whole concept of these boxes in use with a tonneau cover? I am wondering if anyone else has come across this problem, and what did they to do fix it?

Thanks

What part # is the Tonneau you have?