I took the water tank out of our CT13, but it had a drain valve on it so it could be emptied. I'd put a little rv antifreeze into it through the fill port on the side of the trailer. Also check to see if there is any low spot in the water line that a garden hose screws onto, get some antifreeze into it somehow, perhaps a funnel and small hose. Take out the
battery if you have one, store it in a warm place if possible, charge it before reinstalling it next spring. Main idea is to get out any water or get antifreeze mixed in with it. At least put something under the
tires, like a board, if trailer is parked outside for the winter. If you decide to jack the wheels off the ground, DO NOT support the trailer with concrete blocks, they can break or crumble, a potential hazard. Shut off
propane tank valve. If it's the typical
Uhaul that has leaky
windows, move all cushions away from them. Put in a few mouse traps and check them occassionally. That's all I can think of right now. Bob