My dad built one for the truck Im driving now...it used to be his. It fits under the campershell and has a compatment on each side of the the bed, above and on the sides of the wheel wells...it also has a flat part that fits between the two, basically like an entire bed that has drawers and cabinet types things. I can see if he wants to sell it. It was in a 99 ECSB if that is any help...I can see if he wants to sell the shell too...if youre interested.