We live beach front in Southern California. Our car lives outside under an Evolution 5 car cover. We learned the hard way not to use other than a breathable fabric. Our coach is parked here about 7 months a year. Cover? Nope, the friction from the wind would trash it worse than the salt and wind. We hand wax religiously once a year and after a big wind, rinse off the salt. The last coach didn't need a paint job until it was 23 years old. I'd be horribly afraid of using a non breathing tarp over the trailer. Been there, done that. I'd leave it exposed first. Good Luck!