Just an alternate opinion- I'd say not that horrible, probably looks worse than it is. Surface rust all over the frame- cosmetic. Every body on frame vehicle looks like that in the salt belt. Every 4R, Taco, LC, GX, LX, Sequoia, Tundra, F150, etc. It took what, 10+ years to get that bad? So maybe it'll ONLY last 30 years total?
When shopping for mine I know I didn't see any cruisers discounted for frame surface rust. Zero valuation influence by any valuation standard whether it be KBB or your insurance company. Nobody says "yikes, frame has surface rust, knock of a few grand".
Shock upper bolts- sawzall without question. No biggie there- SOP. You don't even attempt nut removal and generally get adept with the cutoff wheel and recip saw.
You will have to replace every single part of the parking brake- I can already see those bell cranks are hosed from the pictures. Spare tire is probably siezed up there so the winch mechanism will have to be soaked in oil and the rear bumper support is probably nearly dust. Those are a couple negatives.
If you have the time and money and work schedule, and patience to fly somewhere salt free, see a car, hope it is up to standards, then drive it back then yes, that's a really good idea. I've done that multiple times and on at least one occasion driven a car home that I should have passed on just because time and money was already invested in the trip. Just be careful and realistic with the "buy salt free" plan and know that your truck will look like that in no time once you get it home.