I'm just south of you in Liberty. Our 5th wheel gets a lot of southern exposure on one side. It has oxidized badly. I tried every easy magic spray on-wipe off sold I think. I started compounding it with Chemical Guys Heavy Boat Compound and a Porter Cable buffer. It helped a little. I went over it with Klasse One and Done and that helped a little more. But it still is ugly.
All that said my advice would be to use whatever you like but use it often. I know it's hard to do in Houston summers. Only an hour or 2 before dark when it's physically possible to do much work.
Good luck and let us know how it goes.
If you want a place for polishes, waxes, and advice.....autogeek.net and chemicalguys.com