Auto and RV dealers all market a variety of products affectionately known in the industry as "mop and glow". Some of the products are applied by hand by dealership employees or contractors, some by a carwash-like machine and some (like the example I saw at an RV dealership some years ago, where the dealer just handed his customers a box of two or three small bottles and a buffing rag for $1200!) you do it yourself.
In any case, they are all just various forms of wax and/or emulsified plastics or silicone. None that I have ever encountered (and I was in the car business for some time) provide any protection beyond what you get with a good wax job - many much worse. They are mostly designed to give the inside of your wallet a smooth and slippery surface in the finance office. Save your money and get your rig waxed once a year. If you can't or don't want to do it yourself, using a good qualified detailer will still save you money.