Ultimately, I would think it impossible to stop/prevent. The metal is rusting from behind the paint. I imagine it could be slowed down by keeping the environment as dry as possible. And maybe some of the other techniques mentioned may help. But I would think a dry environment is most important.
I noticed you live in Michigan. Imagine how much moisture is delivered to the environment every time you pull your cars in in the winter and they drip in the garage. I have the same problem. Garage is very damp in winter. I'm planning heat, better drainage and a dehumidifier eventually.
My 2 cents.
