[flybouy]

Danny makes some excellent points on the clasa A's. Diesels were born to run and tolerate setting well unless properly mothballed. Oil seals dry out, lubricants drain off of internal engine and drivetrain parts allowing corrosion, etc.

If full timing, take into account the necessary time and money for maintenance as you will be residing elsewhere while it's in the shop. If you do your own maintenance like brakes, bearings, change tires etc. chances are you can't or won't have the equipment or expertise to do that on a big diesel pusher. Some some more things to consider.