Like Johndar said check the caulked seams for cracks. Check the lug nuts to make that they are torqued right. Check the tire pressure. Every one or two years check the wheel barrings and repack them. Fill the water tank, run the pump check for leaks. Make sure the hot water heater (with water in it) is working. check the refrigerator compartment for nests. Wash the outside and roof with soap and water. Then wax the outside walls.