I always say, why not winterize it, then continue using it throughout the winter -- dry camp (like back in the days when you tent camped), except you have the luxury of using everything except the on-board water.
Pick up a port-a-potty from Wall Mart, you can use that in the bathroom, and dump it into the campground pit-toilets (no chemicals). Bring your water in jugs, catbath, and still enjoy week-ends going somewhere.
Indiana State Parks let you camp all winter. No water, but do have electricity. Pick a camp site near a pit toilet and you've go the entire campground to yourself! No one goes in the winter. It's an awesome time to go!
Wash dishes by catching water in a pan and tossing out the door or in the fire pit or into the pit toilet. Heat water on the stove (like you use to do over a fire when you tent camped). Let the fun continue all winter ... even in the snow!