Check the caulking and seals around doors, windows and all corners and edges of the vehicle. If you see cracks or missing sections of caulking, then repair it. Caulking will make sure that your vehicle remains sealed and resistant to moisture and other debris. 

Protect your water tank and hoses. If water freezes in your vehicle, then it can cause extensive damage. Wrap your pipes in insulation to protect them from the cold. Do not keep standing water in your tanks if you plan to not use the vehicle for long periods. 

Insulate the vehicle appropriately. You might need to cover your windows and wrap your refrigerator pipes, gas lines and outside vents. 

Make sure your tires are winter-ready. Test them to ensure they have appropriate air pressure, and consider installing tire chains on them, if necessary. 

Take precautions to stay warm. Consider placing a space heater in your vehicle but be careful to keep it away from flammable items. Travel with plenty of blankets and warm clothes. Also take along a hair dryer to help fight frozen pipes. 

Check the vehicle’s fluid levels, battery and engine before leaving. Cold weather could cause old or damaged systems to ultimately fail. 

Make sure that your headlights and wipers work appropriately. 

Carry emergency equipment like a shovel, ice melt, cat litter (for traction), jumper cables and a generator with you. 

Keep your cell phones turned on and make sure they have service at all times.