Confirm the materials used in construction of the frame and walls and the model name or number of the trailer. Ask to see the trailer's proof of registration to validate at least some of its pedigree. Jot down the serial number and call the company for more details on the model and production date, and to learn more about the type of axles, metal body, and paint used. The chassis system includes structural and moving component subsystems. On any trailer, examine the exterior structure for signs of corrosion of metal alloys.
Paint is a rust barrier, shielding steel from oxidation.
Mark Podeyn of Action RV, Albuquerque, N.M., specializes in inspecting and servicing steel and aluminum horse trailers. We look for rust on all trailers. He described how rust can be cosmetic or structural. On a steel fender, consider a rusty scrape as cosmetic. Structural rust is more serious, generated from moisture from the inside out.