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I live in those kind of temps all winter.
Turn off the city water, and drain the hose.
Drain the tanks or leave the tank heaters on.
You don't have to drain the water heater & internal lines, but you have to leave the water heater on if you don't.
Turn the heat back to 55.
If you are on electric hookups, add an electric heater set to run in the 60s. That should help the propane last longer, but the furnace will still run to keep things from freezing in the basement depending on your RV.
I added a 250 watt heater ($10 at Walmart, it has no thermostat) in my basement to keep it from freezing with an outlet plug that turns on at 35, and off at 45.
You can find the outlet thing at farm & ranch type retailers, or just let it run while you are gone. This is plugged into a spliter on the outlet in my basement that runs my vacuum.
YMMV
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