Has anyone converted an open trailer to a closed trailer? I was looking at closed trailers around here and at my buddies closed trailer for his race car. From what i saw all the trailers are just plywood inside with angle iron around the edges for strength and then aluminum sheeting on the outside. I have a 14x7 trailer now and it would be easier if it were enclosed so i could leave everything in it but I'd live with buying a shed and putting everything in it at night if i had to instead of buying an enclosed trailer if this isn't possible to do. Pics would be good if anyone has done this too.