Yesterday we returned from a 500 mile trip in 100 degree weather in our 1982 Kings Highway. That was a high end unit with all the bells and whistles when new. It now has nearly 180 K miles, the original frig, one original AC, one was replaced that was a mistake. The unit is heavy fiberglass including the roof, 454 Chevy, P 30, Kohler generator. The radiator has been replaced as well as exhaust manifolds. We have never had a parts or fiberglass problem. We like the unit and never wanted another, it is not as shiny the last year or so as at 89 I just don't wax it like in the past, maybe we are just wearing out together. I think it has been maintained better than it's owner. We plan a 2500 mile trip in September and that may be our last longer trip, but the motorhome will be read to go. Do I believe a new motorhome will last as long? No way.