The problem with the Uhaul camper frames is that there are several sections that are round tube. Once water gets in it stays there and rusts the frame out from the inside. Several owners have had to either replace the whole frame or replace sections.
Judging by your shop, you shouldn’t have any trouble repairing the frame.
Maybe putting weep holes in the tube sections would help any water drain out.
Yes, as soon as I get it done, I'll put weep holes in the bottom of the tubes, they had them half way up on the ends, water would just set there could not get out
What I had found was 14 of the 25 bolts were rusted In too that hold the body to the frame. With the older trailers we need our bolts checked so what has happened to some of the people doesn't happen again to any one