I'm also in central FL and it said to myself last night, "I need to drain the lines" then promptly forgot :-/
Getting older sucks.
The good news: It only got to 33, though it was predicted to be ~25. Tonight it's predicted to hit 24, and in case they're right this time I want to be ready. I don't have time to go get antifreeze. I have a blow-out plug but am not sure I'll be able to get a compressor on it. I don't know how much propane I have for the furnace (just got the RV) but I can try that. Do I just do that and drain the lines and hope for the best?