I don't know that anyone but you, trying it out, can tell you this answer. It's so contingent on your particular weather.
Yes, you can add an adapter and use a large external propane tank.
I'd worry most about potential fire and propane gas leak issue for a heated coach that's being stored.
I was going to ask if a small electric heater could do the trick, but I'd worry about the safety of that as well.
Store it in a covered storage - or store it at the Texas Coast and just drive down in your Toad, take the RV out of storage and use it there. Putting it back in storage there when you are done.
Or split the difference. Store it in San Antonio - outside storage is about $100 a month no contracts needed. Drive to SA and pick it up and drive to the coast about 3 hours away. You'll save enough in fuel for the rv and the heater to pay for the storage.
Storing at the coast may be a salt air issue you might wish to avoid.
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2017 Winnebago Adventurer 37F
2016 Lincoln MKX Toad
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