Drain all of the plumbing and holding tanks. If needed, drive to an authorized dump station found at campgrounds and interstate rest areas.
Add a half-gallon of anti-freeze into the holding tanks. Pour two or three cups of antifreeze into each drain on the camper van. This includes sinks or showers, if your van is so equipped.
Change the oil to a cold weather-based oil such as a 5W30. Consult your owner's manual for winter oil recommendations. If no manual is available, use the 5W30 as a general winter oil.
Adjust the tires to a lower PSI. Read the side of the camper van tires to get the recommended tire PSI settings. Winter driving requires a better surface area for your tires. This is achieved by letting a little air out of them. If you can afford it, change the tires to a studded or winter/ice set.
Place extra sleeping bags and blankets in a storage closet or drawer in the camper van.
Place the heat-shrinking cold weather film over each camper van interior window -- in the camping area only, not the cab. Blow the hair dryer onto the heat film to set in onto the windows and prevent heat hemorrhage from the window seams.
