Went to look at an older Wilson trailer today.  DH200?  Anyway.  Two rivets popped loose in the hopper slope, and allowed grain fines to get down in the side panels.  The aluminum skin is corroded through both inside and outside.  Inside not as bad.  How major of a repair would this be?  The rest of the trailer is pretty decent.

Outside.  Just between two ribs. 

Inside

Rivet popped out on side slope.