[Bigdav160]

My Suburban came out of southern California but, from the story I got from the previous owner, it spent a lot of time down in Baja.

So my rust problems aren't the ordinary ones.
So I'm curious what caused this rust on the inside. The fender well area looks pretty clean. What the heck was that hole used for? This is on both sides.

I'm not sure what attempts I should make to address it.