As for the rest of what I have in the rear of the truck.....
I picked up this military surplus box from a local surplus place (I painted it silver) because it was a good size and was waterproof. I love the latches on it. I use this to hold my tow straps, extra fluids etc. I also have a spare birf, axle shaft, rear control arm, and some other spare parts in there.
Love these latches.
I use the factory rear tie downs and a couple of turnbuckles to keep it secured in the back. Yeah I know, this probably ruined the waterproof aspect of it. Oh well.