102" is the legal width for a trailer in all states,..SS 7 folded width is 96" that leaves 6 " for structural integrity of the trailer wall plus clearance for the trailer wall and the wing. a 1 inch thick wall built correctly ..like a cantelevered truss,..it will more then support the weight of the roof of the trailer providing you build it of like materials and don't park your truck on top of it

Chase