I'm from that area and saw a lot of them too on the road during the winter months. AND During snowstorms sometimes being pulled right behind the salt trucks!
Yup and my thought were not about RV sales. My observance was more about all those RV's running down the road in snow and in knee deep salted roads and the under carriage never power washed off when they reach their destination. And sitting with all that salt for months in some dealership lot.
Note to anyone:
Plan on ordering your RV so that it arrives BEFORE the snow flies and BEFORE the roads are covered with salt. If you want a salt free under carriage new RV.
And if you are buying off the dealers lot? Crawl underneath you will be mildly surprised how many of them are coated in white dried on salt. Been there done that saw it! :W