We park Rocky undercover and the only places that get sun is on the rear and, in the late afternoon, the street side. The rear is where it gets hit all day. Many have used the 303 and we just recently bought some, but never got it used yet. Agree that the sun is the worst enemy. We are looking into a good, cost effective way to block the sun from the rear. Wish we had realized that we needed the rear of the Rockyport closed in when we built it. Found a solar screen product that looks like it might be promising....lets in light but blocks the UV rays. If there is a way to get into an area not exposed to sun, I think that's the best way.