Ozzie is right--fill that fresh water tank and use it in the cold weather. It's nearly impossible to disconnect/reconnect to a water source during those temps and be able to get water going again. We lived in our Montana through a Horse Prairie, Montana, winter with regular temperatures of -40 to -50. Although we had a well on our property, the 50-amp connection was so far from that well that we couldn't stay connected to water even if we'd wanted to do so. Instead, we used our fresh water tank. I think we froze up maybe 3 times, max, during that time, and never froze up for more than an hour or so. We ran the furnace to keep the basement warm and used a ceramic heater inside to keep our feet warm. Also, because we were going to be living for a full year in our rig, we put up a jerry-rigged skirt around the trailer and ran a small heater in that area when the temperatures dropped lower than -10. I know you're on the move, so skirting isn't an option. However, if you're in that temporary below-freezing situation again, just use your fresh water tank and keep your furnace running. I bet you won't have any problems.
For some real cold weather tips, I know Icehouse would be your go-to guy. He and his wife lived in Alaska in their rig during an Alaskan winter and had to deal with all kinds of severe weather problems.
Carolyn
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