Having lived on Long Island, I will say that trucks from the Northeastern US... make that, all vehicles from the Northeastern US are by far the most rotten I have ever seen, and I have been a gearhead my whole life. They use SO MUCH salt and sand on the roads in the winter, it's incredible. The sand used in the mix is large and coarse, obviously due to its function. The salt is also large and coarse. I owned a late '90's 4Runner that I brought to Long Island from San Diego, a California truck from day one, and in just two winters on Long Island, it degraded visibly and rapidly on every surface underneath the truck. I made every effort to spray it off after driving it in the salt/sand mix, even using hot water from our shop garage whenever possible. And as a lifelong car nut, I was always paying attention to other cars... they just rot away up there. I would never touch a vehicle from the Northeast.
Also, I have seen a lot of vehicles being sold here recently in NC as "Southern" vehicles... having spent the majority of their lives up in the Northeast. They buy 'em cheap at auction from up there, and sell 'em here for more. Be forewarned.