16" on center cross members 16" on center roof bows therma cool ceiling 16" on center tubing sidewalls 2000 lb a-frame jack w/ sand foot 2 5/16" coupler 48" side door w/ flush lock 6" tube steel main frame 16" flap on ramp door black .080 polycore exterior 3/4" plywood floors 3/8" plywood walls 2 12vt led dome light led lights led dual tail lights wire and brace for a/c 3500 lb drop leaf spring axles w/ e.b. 7 way bargman plug heavy duty ramp door w/flap door hold back v-nose w/atp e-z lube hubs extra marker lights http //www.trailer-mart.com/--xinventorydetail?id=14367645