I currently have a class c MH. I am considering moving up to a 2008 class A d-pusher. This unit is like brand new with only 9500 mles on it. Not being familiar with a diesel, I am wondering if there could be a problem with a diesel engine that has not been used hardly at all in 5 yrs. Any advise as to what I need to consider. I do realize that tires may be an issue. Anything else. Cautious!!