Does the auction allow thorough inspection before you bid? If not, then don't even go there.
Roof leaks. Friend had a small TT he used as a hunting cabin. Had a leak at the corner of the roof that he did not find until he noticed the corner and side bulging and soft. WOOD ROT in the frame. Upon inspection he found other leaks in other hidden areas. Repair estimate was greater than value. Traded it off to a dealer who put it on his lot and sold it. Have no idea what the dealer told the buyer. Probably nothing.