[rohrmann]

It might be worth your effort to contact a local propane dealer and have them place a large tank next to the rig and connect it. We went over a month in Missouri last winter with lows down to single digits with no problem, except had to fill a tank every other day. There were no issues with freezing the plumbing using the propane heater, which adds heat to the belly area where the tanks and plumbing is. We used a Pirit hose and the riser/faucet at the campground was equiped with heat tape. If we knew early on during our stay, we would have had a large tank installed, but by the time it got real cold, we were getting close to leaving.