Got the idea from my buddy, though his was a steel trailer with wood bunks. Mine is a 12 footer V shaped aluminum. Usually carry two quads with wood burning stove at front. Sides are 4' high 1/2" plywood, canvass top. We put down foams pads on the floor, that way you can walk in there without boots and it adds as floor insulation.
A view of the inside. You can confortably have three cots running front to back.
