Aerospace 303 is highly recommended for rubber products. It is one of the only products that are actually beneficial for protecting tires from sunlight and ageing. I have in the past used it on plastic products too, until I found a better product for plastic ... Plexus. As far as the rest of the coach goes, I have tried all kinds of waxes and eventually found the best product for me was REJEX for my fiberglass body. It produces a long lasting shine and provides good protection from the elements. Its application comes far less often than wax products.