I would like to know what you used to build them they look great.
The drawer system is built out of 1/4" plywood and 1x8 and 1x6 pine boards. I used indoor/outdoor carpet from Lowe's to line the drawers and the top. I used angled aluminum to line the front and rear edges. It's a pretty simple build. I chose not to use roller slides for simplicity and mostly laziness and cost. On the front edge are some plastic drawer sliders to help out with friction when pulling in and out. The box is held in with cam-buckles on slide-lock type mounts in the bed.
In the metal bed box is the more "fragile" stuff. In here I keep my aux battery, compressor, and fuse block, along with some tools and spare parts.
I keep my recovery gear in a small duffle that goes in one of the drawers when not camping. When camping, cooking gear and other misc supplies go in the drawers and the recovery gear moves to the bed box.