Some of the less obvious: Torque wrench that goes up to at least 120 ft/lbs for the wheels, and tire pressure gauge and compressor or pump. Set of 1/2" drive sockets with ratchet but also large handle. Coil of wire, zip-ties, bungie cords. Variety of screwdriver types and sizes. Adapters for 30 amp to 50 amp service, and from 30 amp to 20 amp service. Pressure regulator for when connecting to city water. We bought some rolls of rubbery shelving material that helps keep things from sliding around and cut it to size. It was easy liner, or magic liner, can't remember the name
but Home Depot has it..
