we have found that while traveling on the road, we add antifreeze to the tanks, and the toilet bowl, but that all the bouncing around on the road keeps the lines free (unless really cold, ie close to zero). Even in the mid 20s when camped, we have not had a freezing issue, other than the city water hose.
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Mike and Lorraine
2002 3655 FL, 2005 3650RK
2010 3665RE, 2015 3910FB
F350 crew cab dually 6.7
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