lots of rust on 2008 country coach affinity chassis

Lots of salt is used in the winter in Canada & northern states. I've had Rust Check applied to a number of vehicles I've owned over the past 30 years. It stops rust if started and penetrates into places not otherwise accessible. I've heard the city in this area applies it to the trucks that spreads the salt on the roads & highways. I'm not sure if they are in your area, but you can find info on them here:
http://www.rustcheck.com/