Frame cracks at the suspension hangers, broken hitch receivers from over-torque or rear damage, cracked tongue welds on travel trailers, damaged stabilizer brackets, broken rear ladders and bike rack mounts, and aluminum step or hand rail breaks.
We see a lot of trailers and fifth-wheels coming back from rough roads with hairline cracks in the frame web. Those weld up well when caught early. For full builds and modifications, see our trailer welding page.