Little Door into Truck Box Front Left Question

We put 2 sets of leveling blocks in there and a small toolbox.
Our camper sits up above the bed rail by 4 1/4" giving us 1 3/4" space over the cab clearance lights. This gives me room to reach over the rail on both sides for storage of all kinds of handy things like chocks, hoses, electrical extensions, folding shovel, soft drinks,just use your imagination.