Take the camper to a certified dump station. Find these at campgrounds or certain highway rest stops. Drain all water tanks including the grey and black water holding tanks. Drain the water from the toilet.
Pour anti-freeze into the grey and black water tanks and into all drains in showers, sinks and the toilet.
Place heat film around all windows and turn the hair dryer on the film until it is tight and attached the windows.
Fill water jugs to store drinking water in the camper itself, and not in the fresh water-holding tank. This prevents drinking and cleaning water from freezing and being contaminated by anti-freeze. Store extra winter rated sleeping bags in the camper.
Place a propane heater into the back of the camper. Use this to supplement heat form the camper's installed heaters. Be sure to vent the camper door when using the propane heater to prevent accidental asphyxiation.
