I would not consider the difference in miles a factor, that seems very close to me, and both reflect some reasonable use. Good would be evidence of regular use with no extended periods of sitting. Better would be that evidence AND full documentation of maintenance. Tires should be reflected in the price, they should not be more than seven years old - might reflect neglect in other areas.
The anti-freeze tank probably just succumbed to sun damage. I replaced one on a friend's coach, after I put my fingers through it.
Unlike the post above, (and all respect to the poster), I would not worry too much about appliances. They wear, they fail. They can be replaced with a stop at a RV center and a charge card. A fridge won't be cheap, but it won't be like a failed engine either.
When you begin enjoying your new coach, start a log. Document everything you do to it, oil change, tightened bolt,greased fitting, part numbers, phone numbers for sources, stuff you hear or find on the net. When you sell, the next newbie will think you are a god.
Matt B
