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Use the small heater and leave some faucets open (both hot and cold). That would give the water someplace to expand into/away from. Open up cupboards to let the heat into where the plumbing is. Under the coach you can also use a clamp on 100W lamp aimed at some lines/areas.
Even if you don't have heaters on the waste tanks I think those will be just fine--the waste tanks aren't a closed system.
Usually it isn't below freezing for the entire night; it gradually falls and is coldest right before sunrise.
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