I agree that driving on roads that have salt will cause under carriages to rust IF you do not wash it off after such trips, But it seems like I have read many posts from Winnebago owners that have had a rusting problem. One that really sticks to my mind is the owner of of a Journey and he posted pictures of the problem and it was terrible the way every component was rusting away underneath through out the chassis parts. I figured that maybe the coach before it was sold had been in one of them places that have had severe flooding and the coach chassis was under water. But I am not sure!