My 2007 grand caravan is rusting on both sides of the rocker panels, holes you can put your hand in,, when ever I see one in a parking lot they all have the same rust..i have 62000 miles on mine, the rust is coming from the inside out.. I took it to a car wash a lot but I realize they use recycled water that has to have some salt in it..i also have one of the electronic rust preventer on but it is snake oil and is a waste. I live in northeast Ohio and the roads are salted