Modern paint is color under a clear layer that takes the UV hit. Clear-coat is a consumable, and in southern Nevada it’s consumed faster than almost anywhere else in the country.
Horizontal surfaces go first — roof, hood, trunk lid, the top of an RV cap — because they take the most direct sun. On vehicles that sit parked for long stretches, the driver’s side often fails ahead of the passenger side simply because of how it’s habitually parked.
The failure sequence is predictable: gloss dulls, then the surface chalks to a matte haze, then the clear starts peeling in sheets. Polishing helps in the first stage. By the peeling stage there is no clear left to polish and refinishing is the only real repair.
What actually helps: shade or covered parking, regular washing to get grit and contaminants off, and a sacrificial protective layer — wax, sealant or ceramic — maintained rather than applied once.
If your clear is already flaking, don’t spend money on polish. Get the affected panels refinished properly and protect them from day one.