I used to live in the "rustbelt" and it's hell on automobile bodies. I see why purchasing a plastic bodied Saturn makes sense. Nothing worse than almost having your vehicle paid for then dealing with rust holes in the body and a pitted frame from corrosion. I think the New VW Beetle bodies are 100% galvanized steel and use plastic fenders, so I hear rust is minimal on them because of that. Why can't all auto manufacturers do that? Planned obsolescence?
http://www.tundrasolutions.com/forum...s-100_0477.jpg
I would unbolt the bed for easy access, sand off all of the rust with a grinder, then apply POR-15 with a brush.