Is there any reason why you shouldn't place your flooring directly on the trailer frame?
I've got a 7'x11'ish trailer that will have a ceiling height of just over 6 feet. So my walls will be three 1/2" sheets of OSB skinned together with the length going vertical. The flooring as it's planned right now will just be 3/4" OSB bolted directly to the frame. The frame rails are 4"x1" C channel across the sides and front, and the rear is a 3"x3" boxed rail across the back. I know on the typical build the walls are bolted to the wooden sub-floor frame, so my plan was just to bolt the walls directly to the metal frame of the trailer.
Technically speaking, the frame walls are not 100% straight. I left the floor at least an 1/8" overhang on both sides, with the idea being that the floor will keep things square and a couple of strategically placed shims and washers will absorb the gaps in the overhang.
Is there any reason why I should not do this? Or anything I should be aware of if I do?