With such low mileage it is assumed the coach has been a “hangar queen” most of its life. Storing a vehicle is not a big deal, but chances are this coach has not been treated as a “stored” vehicle, but one that has sat awaiting its next trip.
I would be concerned about the condition of rubber parts which seem to always preform better it exercised routinely. Air bags, brake chamber diaphragms, tires, Norgren valves (the o-rings), and countless other items that do not benefit from just sitting. I would question corrosion of the engine on the coach and generator. Even if not corroded I cringe when I think of an engine sitting for a long period, and then the scraping of metal to metal when it is started and prior to the circulation of oil. Maybe others are not concerned and see low mileage as a plus, but I see it as having the potential to surprise a new owner for quite a while with problems that crop up due to inactivity.
If the coach was stored with the air compressor on, or if the engine was started and run for a little each month I would run away from it because the moisture from both is probably more damaging than just letting it set. If it sat outside I would run faster.