just thought id share what I hav found.
I was set on Krown but wasn't happy that I was going to have to drive to the other side of Michigan every 12 months to get it done. I found this treatment by chance and the reviews on it are just as good or better than krown in some peoples mind.
Corrosion Free - Rustproofing Rust Cure Formula 3000
It stays on the truck longer than krown (supposedly) from what iv heard. if i remember correctly the "tech" i talked to said it is only required every 18-24 months to stay in their warranty. the price is very similar to Krown too.
I will post my experiences when i get it applied in the fall.
EDIT: I have also heavily considers doing the spray gun rout with "Fluid Film" but buy the time I buy everything for it the price is very close. I also dont have a hoist and laying under the truck while doing this would SUCK.