Just bought a brand spanking new 2021 Colorado ZR2, my first truck. I never even really considered trucks until I got into woodworking a few years ago. I know the bed is short in width by a few inches but they're drawer systems out there that raise the bed above the wheel well.
https://offroadpowerproducts.com/dec...=20&model=3720

So... will 2020 parts fit a 2021? and are there any other options to haul sheets of plywood?

OH! who are some good, reputable parts manufacturers for things like side runners?

Thanks in advance.

 

Wish I could help but it would be a guess.