For a travel trailer: Check the roof and reseal, check for any other leaks. Keep the battery watered and charged up. Keep the tires covered as much as possible. Otherwise, best to just leave it alone.
A motorhome also has to consider the drivetrain. Was it put away with a fresh oil change? Was the fuel treated and how long does the treatment last? Did you fog the cylinders? If you pickled the engine properly and haven't been driving it regularly, I would leave it alone and plan on going over the belts and hoses before the first trip. If you haven't properly put the drivetrain to bed, I would look at doing so now and include a 50 mile run before hand to boil off any moisture that may have made it into the motor.