Hard work does not mean better protection of any kind, let alone UV protection. Waxes do advertise that they contain UV protection. I have never seen any testing or independent evaluation of those claims. Here is one person who believes the claims are useless: https://www.youtube.com/watch?v=U-7m5jnr4gU
My RV is 14 years old. It has spent lots of time in the desert southwest. It has always been stored outdoors exposed to the elements. I don't see any sign of chalking or oxidation. If that is a concern I would recommend using Aerospace 303 and not relying on a wax.