You might be able to find a dealer that will do an inspection for you...at a price. Personally I would do it myself, which you should be able to do. As was mentioned a lot can depend on how long it's been sitting unused.
The roof is one thing that needs to be checked thoroughly for any leaks, holes, tears, etc. Then things like the house water pump, and associated water lines. Then check for working water heater, refrigerator, stove/oven, shower and shower enclosure, furnace. Then check the condition of sewer lines, holding tanks, and hoses. And of course all the mechanical functions of the motor/chassis/transmission and associated parts, i.e. water pump, alternator, battery, brakes, etc.
Good luck, and come back and let us know how it has all worked out.