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Before leaving our last campsite we do our tank flushing and then add a couple of gallons of water in the black tank and add chemicals. It stays there until our next trip. Since we are not heading south this winter I may add some antifreeze to the black tank and put a heater in the trailer. It is supposed to get down to 23 to 28 degrees this week. The trailer is under cover with the front exposed so the back is pretty protected. Two years ago it got down to 15 degrees before I put heater in and did not have any problems. First time in 5 years we haven't went south.. Don't think I am going to like it.
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