Although it may have been stored undercover parked on dirt will cause some rust to build on exposed areas. The problem is once the rust gets into the steel it's nearly impossible to stop. From the description it almost sounds like the coach was in a minor flood. 2008 isn't old enough for the rust to the extent as described to occur thru normal wear and tear. I would reconsider unless you plan to keep the coach until the wheels fall off which might happen sooner than you think.
What also don't add up is the location history, presuming the coach is in Vermont. Owners live in Nebraska and wintered in Arizona. How the coach end up in Vermont or even this side of the Mississippi?
