I bought a used 2001 Toyota Camry this past summer.
Overall it's in great shape, and I presently see no rust.
Living in Wisconsin, we use salt pretty liberally to deal with snowy and icy roadways. My last car, a '97 minivan used exclusively in Wisconsin, had basically turned into a pile of rust. This included a rusted out strut tower [which a TSB was published for; this issue is most common in the "salt belt."]
I'm a bit worried about my new car suffering the same fate, since it will be parked exclusively outside.
So far the only problem I've had due to salt is that my aluminum[?] rims corroded slightly, causing a pretty nasty tire leak.
What are some ways I can go about preventing body damage from the harsh winter months?