[LT7A]

I agree. Pressure wash in lieu of sandblasting. You can get a mild acid wash from Napa, meant for cleaning big rigs and that will take off most surface rust, but you will want to spend some quality time again with the pressure washer to make sure to get all of the acid washed away. After that, your truck is nice enough that spending a couple of afternoons under there with some Rust-Oleum paint would be worthwhile. The only places I would put rubberized undercoating are in the wheel wells and the sheet metal bottom of the cab. But you need to have them clean and dry and have the rust treated first. There are a few different rust neutralizers that act as a primer when cured. Rust Mort is one of them.