Frame Repairs

I'm not sure that I would consider Tennessee part of the Rust belt. I think this was from neglect, PO never washed it out or anything like that.
Do they use salt or calcium on the roads there?

One of the most rusty trucks I have seen came from Michigan, it was 2 years old.
My neighbor bought it when he went home one christmas from one of his dads friends.
It was nothing but a ball of rust underneath, after 6 months, all the fuel lines rusted out along with the brake lines.
The exterior body looked really clean, I told him to trade it in asap, before it totally fell apart.