A co-worker had a similar year Durango that the pan was badly rusted on (as well as the rest of it). It was actually weeping oil when he traded it in. The only other pan I've seen rusted through around here was on a 2.2 in an Omni GLH I had. They do get rusty around here like Gene said. The road "salt" is more like salt/acid.

A hobby of mine is sitting in the living room watching the rockers rust off my old truck.