I live 200yds from the beach never had any problems last Motorhome was 6 years old when I sold it in perfect nick, my wife's car is 15 years old we have had it for 12 years, passes it's MOT every year, no rust, parked outside on the drive, only gets washed once a year & polished once every 5 years if it's lucky.
Modern vehicles are much better these days and don't rust like they used to, Fiat's are galvanized.
Perhaps you should say Never buy a vehicle for the Midlands or North of UK where they regularly spread salt on the roads. This does far more damage as it gets forced up into all the nooks and crannies as you drive.
Years ago I noticed that white cars tended to rust more quickly than darker colours. My theory was that the white bodywork reflected most of the sun’s heat and so the body panels never warmed up as much as they did on darker coloured cars. Consequently wet mud etc., trapped in the wheel arches, stayed damp for much longer.