I bought a 1998 Trail-Lite Model 7213. It was their first year and they boasted that they used â€œRace Car Constructionâ€, a sandwich of 1 Â½ â€œ foam and aluminum frame with fiberglass on one side, and plywood on the other. They claim â€œSuperior Strength, Light Weight and Exceptional Durabilityâ€. This material is used on the walls, roof, and floor. They offered a five year Structural Warranty, which is the only reason I was willing to buy this new technology from a new company without a track record. Before my five years were up the floors started to sag BADLY. My visitors were afraid to enter, feeling they would fall through. I took it to a dealer that, after four weeks getting the authorization to repair, did the factory prescribed repair. After another two week, I picked it up but was not happy with the results. The material has broken down and I get the sensation of walking on a pillow with ribs. The method the dealer did the factory prescribed repair was to add 300 lbs. of plywood and lumber to my underbelly. My complaining that I bought a â€œSuper Liteâ€ trailer and now have lost 40% of my carrying capacity falls on deaf ears. They say that 300 lbs. for the repair was â€œReasonableâ€. I think they believe I should trade it in and let some other sucker buy it, and unknowingly, tow it over its safe GVWR. I didnâ€™t get a new weight sticker and the lumber is hidden it itâ€™s enclosed underbelly. Has anybody else had similar problems with Trail-Lite?