Hi Jaybird,
I put RV antifreeze in all our water lines at this time of year. We live on the coast just north of Vancouver, B.C. It takes about 2 1/2 gallons of the pink stuff. We use our unit three or four times in the winter so I might have to do it that many times. The first month we had the unit (last Dec) we were camping in the Vancouver area and it got down to about 15 F. I ended up with the water line inside the trailer (the one that goes from the back to the front to hook up the city water) cracked and leaking. I was never sure if it froze or was cracked when they put the trailer together. (you would think they would have pressure tested it). Anyways I changed the line myself but probably would have been pretty expensive if I had to pay someone else to do it. My point is the antifreeze is pretty cheap insurance.
~edit~ Oh yeh, I also run a 500w heater on low just to keep any mildew & mold away inside the unit. I put the heater on the counter so it not near anything.
J&D
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