Has anyone considered using the bed from an old 30's or 40's era Ford pickup? They have the same relative design as the M trailers. The reason I ask is I saw one on my way home from work the other day. I realize they aren't every-day common but they are out there in decent shape and made from pretty stout sheet metal. I'm not really in a position to get another trailer right now but I thought I'd pass on the idea.