Drew, "on a side note, my 2500 denali (2020) Duramax payload is 3,009. which is about 1,100lbs more then an F250 Diesel"
With that little grocery-getter you're running around with you wouldn't even be allowed around the campfire where the big trucks gather. They'd be sending you to get more beer.
Is that what you were looking to get started? If so, go hang out on
www.duramaxforum.com. You can buy your bed stack there.