I had my trailer powder coated, not painted. Sofar so good, but not sure what happens if it needs repair/touch up down the road, as powder coat does not come off easily.
My trailer had no stamped or riveted ID, and since I bought it without a title, I eventually had to register it as a home made. As I recall the True Gator ID #’s (if present) were often on the inside of the frame.
Good Luck