Thanks guys. It's a chest from Lowe's actually I picked up second hand. The brand is Kobalt. Yea, I have recovery gear, air compressor, extra fluids, tie downs, nets, extra wood blocks for jacking, giant spot light, etc.
Yea the box is bolted through the bed, with 2 extra tap screws to make box removal not possible when it is locked.
The jerry/water cans just squeek between the box and the railing when empty. I'm not too concerned about extra means of securing them as their weight holds them in place.