That's a pretty slick idea rbertalotto. Certainly eases the removal process. Do you put a 4x4 across the front to help spread the load? Does the "thin box" you have slide out to access all the stuff (so it is a 'drawer'?)
It isn't really an option for a camper that drops down after the 8' box part though.....there is very little clearance before it drops down on ours so stuffing stuff in there doesn't work. I have to put my side spacer boards in before I back under the camper unfortunately, and I can't slip any extra pieces longer than about 14" out there at the edges when the camper is loaded.
But it IS a shame to waste all that space. You could certainly use the space for a storage tank for water as well. Weld it up with stainless or aluminum? Think about this, a 4' x 8' x 3" volume is equal to 60 gallons of water! I've thought about doing that for my wasted space, but I'm hoping to lower my bed at some point and have a much bigger space to use (the camper still has to stay high to clear the cab of course.) Not sure exactly for what though :)
