Having been on the road with real world experiance with short and long term (1week) experiance with cold weather precautions (25 years) and the result of various attempts to keep pipes from bursting. Notice I did not say from freezing. Many posters have indicated and correctly so in my opinion that night temps that drop to 25 or so then rise during the day ahve little effect of damaging water lines that only have water in them. We have on one occasion had to abandone our motor home so quickly that witerinzing for short term exposure as we regularly do was impossible. Night time temps did in fact drop to 25 or so and rose to above freezing during the day for that week were we gone. When we returned from the 5 day absence, the water lines were in fact unable to past free flowing water. I now Know that the lines had developed a slush in them that prevented the water from flowing freely thru the faucet, but ovenight warming did result in restoring free flow of water. As far as short term exposure (overnight) while we are on the road, I can share our experiances as they are many and my practice has distilled down to this. Overnight, without hookups but using the propane heater/furnace either from battery source or generator, ( we have both ) the following is what I have developed we no freezing or slush problem in the morning. The grey water tank is hooked up for discharge to an always carry blue tank so that no material is held in the onboard tank. Then just befor bedtime we back fill the water lines via the kitchen sink's faucet with a solution of 3 to one RV anti freeze/water mix. I do this by hooking up a hose connection to the kitchen faucet's threaded connection and using a plastic squeeze bottle squeezing the bottle to discharge the mix into the pipes till it discharges from the farthes sink faucet which for us is the bathroom. Once pinckish solution discharges from that faucet then I procced to the other side purging both the hot and cold water line effectively to a temp of 10 degrees with that mix. We do have to remember to isolate the water heater from the circut (water heater by-pass) which is already in place as the winterizing option allows us to prevent using RV mix in the water heater's tank. I've used this technique many times including 15 degree overnight with free flowing water in the morning. The Colorado writer's concern should mirror my experiance with 1 week non use with water in the tanks and lines to put his/her mind at ease.
