I am in the process of buying a Motorhome, and the dealer is eager to sell me a 'paint protection package' called Perma-Plate. Way to expensive, I know, but the claim is that with this installed, I won't have to wax the coach. This might make it worth while in the long run. Does anyone have any experiance with this product? In particular, anyone who has it and has not waxed their unit?