If it were me, I would put a few gallons in my fresh water tank to be used over night. The furnace should keep it from freezing and you would have it use with your pump in the rig while you are without outside water pressure. If you don't have an insulated water hose with heat tape, then you were wise to unhook and drain your hose. Keep a hair dryer handy for thawing.
If the propane system is working properly, when both valves are open, the flow will automatically shift to the full tank when the other empties without you having to switch the selector. The selector determines which will be used first.
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