You hit it on the head
Welcome to the Forums....this is the place which will answer many of your questions. You got caught in the BIG buyer fault. There are MANY of the flippers and sellers that just polish it up and put it up for sale. Buyers are caught up in the appearance and don't take time to check out the other import an things. Systems, belly condition, tell tale repair indications. Going to get an Airstream (pick it up and bring it home) costs (me) at least 1000$) and then there is tires and bearings, a battery, AC, propane tanks. Those all override the polish. You live in a beautiful area....go enjoy that Airstream now.
"If it can't be reduced, reused, repaired, rebuilt, refurbished, refinished, resold, recycled or composted
then it should be restricted, redesigned or removed from production."