I gotta check that out. Thanks for mentioning that. It's a crime what salt does. I usually strip the underside of all my work trucks down and do them in Rust Mort or Rust Shield, I forget which one. I used to use chassis saver but rust Mort got my attention a bit back because it takes any existing rust, and chemically converts it to no longer be rust as opposed to just sealing over it like chassis saver. I've gotten it down to a science at this point. Pressure wash under carriage, hit any mild flaking or rust with a big needle scaler and braided wire wheel, blast it all clean with compressed air, and hit it with a spray gun of coating of choice. I can do the whole shebang in a day. It might sound dumb to some guys, but I work way too hard for my gear just to watch it rot away on me.
I'm going to check your link out.