Winter camping

Either you will need to have ALL the plumbing enclosed in heated spaces (that particularly includes the dump valves) - or - you can use any old RV as long as you protect the plumbing. Drink and cook with bottled water; flush the toilet with antifreeze. Our old Class C had exposed black and gray tanks, and we never had problems with anything freezing as long as we added antifreeze to any liquid that went down the drains. We'd use the showers at the RV parks we stayed at. We added reflectix insulation to the single-pane windows; and stuffed foam into the overhead vents - and our 28' MH stayed pretty toasty, usually using an electric heater as the main source.