We had similar here in Colorado for three nights. I drained the lines via low point drains and turned heat on lowest setting. Worth the propane to make sure things were okay, at least I hope. Will find out this weekend!
Tom - 2014 8289ws, 2011 Chevy 2500HD
Pull-Rite 16K Super 5th
2014 Rockwood Signature Ultra-Lite 8289WS
2011 Chevy 2500HD - DuraMax (Just over 5000 miles now!)
Nights camped in 2014 - 21