When I lived/ worked in Phoenix, AZ (Luke AFB) 2012-2014, there was a used car dealer that had a lot bursting full of pickup trucks, and it was not surprising to see a transporter dropping off pickup trucks pretty regularly.Then there's the random guy from Milwaukee who retired and moved to El Paso....
What this used car dealer was doing was buying used pickups, often fleets, from Wisconsin. He would recondition the trucks to include sealcoating the underneath of the trucks to include the frame. No easy visual signs of rust to the untrained eye.
He moved a lot of these trucks. I doubt the majority of his buyers knew these were rust belt trucks.