I think I would ask them for the chemical makeup/description of their products before signing for that much money with the "up to" statement they include. The products sound very enticing, and are meant to, but I wouldn't believe anything without looking into what it is exactly that being applied and what it actually/really does. I remember paying 500+ (forced to) as an add on for a new vehicle for their "exterior protectant" - non negotiable. What did I get? Well, the product was supposedly applied before purchase, and what did I get? A little bottle of some sort of applicant I was to apply to the exterior every six months for it to "work".
Just do you due diligence, it may be worth something. I can assure you that not having to polish, wax and coat your RV every 6 months would be nice....but I doubt this product is that since I've not seen or heard about it from lots of folks trying to find that "easy" way out which this seems to work toward. Good luck.