I mostly use the bed for carrying 4 x 8 sheet goods or other lumber. The Chevy bed has accommodations for placing a board across the bed near the back at about half the bed height. I can open the tailgate and side the wood into the bed resting on the board at the back and the bed at the front. Then I just wrap a strap around it to keep it tight.
For moving taller items, I would have to remove the cap or I use a small utility trailer. If I end up satisfied with the topper, I may do something a little more permanent and with more utility like Bondo's masterful design. This is a temporary design and build that sacrifices some utility for quick and cheap.