I painted my trailer with two part white epoxy paint. It left a
beautiful finish and is just about bullet proof. Costs about $100 for
2 gallons (one each part A and part B). Two gallons did it.

You can find it at high end paint only stores (not Menards, Home Depot,
etc). I used Benjamin Moore "Polyamide Epoxy". It is tintable so you
can get any color your heart desires.

Enjoy, John