Batteries are hard to charge in cold weather. They charge slowly and discharge quickly. Battery loads are high in cold weather. The furnace is the heaviest user of battery power (the blower). Starting a vehicle engine or auxiliary generator requires more battery power in cold weather. Water supply hoses will freeze if left pressurized and connected to the RV pressure fitting. Holding tanks can freeze, particularly while driving in subzero weather. Dumping valves can (and will) freeze and become unusable until thawed. Internal plumbing, including the fresh water tank, is usually protected from outside temperatures, but in severe weather, could still stop functioning. Keeping heat on in the RV, with cabinet and storage doors open should protect plumbing. DO NOT insulate the pipes from the inside (warm) air. In really severe weather conditions, leave the water system drained or filled with anti-freeze, and carry potable water in jugs for cooking and drinking. Protect your holding tanks with automobile anti-freeze. Storing your motorhome for sever cold requires draining the fresh water AND the water heater. The entire water distribution system should be drained through a low point drain, or by blowing the pipes clean, using compressed air. Don’t forget the water supply to the toilet. Kitchen and wash basin traps should be filled with nontoxic antifreeze. Batteries should be removed or kept fully charges. Of course the vehicle radiator should always be filled with 50% antifreeze.