Well since you brought up pets and the build, my poor Border Collie slides all over the place in the bed, trying to think of something to put back there to give her more traction? Thought about buying either scrap carpet or one of those rubber bed mats that I could velcro in or something? Would be interested in your solutions!
I'm still up in the air with what's going back there. I want wheel well toolboxes on both sides, then maybe some kind of wooden platform on the floor like those drawers everyone builds or a great way to stow the spare tire. Then I planned on carpeting everything, even the tops of the tool boxes. The lab likes to stick her nose out the window, so I know she'll hang out on the box with her nose out the slider.