It will be nice to find out how to control your furnace, but I have to ask 'why' you would want your propane to be used while your rig is in 'storage', especially if for the whole winter months.
If you have 50amp service, why not just plug in a few small temperature controlled space heaters? This way they don't get powered unless the inside temp really falls to a freezing temp, which is really to only time you need to be concerned about it anyway....nothing freezes, otherwise, whether there is water in the lines, or not.
On our similar rig, the Palazzo, you can also put a small heater down in the water bay, for the same purpose, and then you don't have to worry about winterizing your coach at all. The heat will take care of any issues.
Most of the time it takes REALLY cold weather temps, for a long, long period, to really cause any 'concerns'... most anything 'inside' of your coach is somewhat protected, anyway, only things that are outside and subject to the additional wind and effects of the temps would be suspect, but I doubt you have anything outside to worry about since your tanks are all inside your basement, your water and water systems are all inside, and you have access to 50amp power, which is just like if someone was living in the coach, only that you are not there with it.
We just moved from the western NC Blue Ridge mountains, and had our Palazzo in storage over the last several winters, with no issues - and I've never used winterizing 'fluid' or anything like that = only draining the lines. Leaving water in the water tank is usually also not a problem since it is within the basement, and bulk water takes a LOT more lower temps for a very long period to ever be a problem.
($16 temp controlled space heaters at w*mt and other stores - just turn OFF your inverter, and let the 50amp power take care of them)
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The Turners...
'07 Rockwood Signature Ultralight...
two Campers and two Electric cars : )
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