I too don't worry about a one night low temp like that especially if it warms back the next morning...
Of course this is for you to decide what you think you should do haha...
I live here in the Northern neck of Virginia where for the past few years it is only down to freezing a couple times a years and usually just for the one night.
I am setup with my OFF-ROAD POPUP camper with using the blow out method to purge the water in the lines. I can do this real quick if necessary in just a few minutes. It really is great to have this method along with you on those sudden trips up in the mountains where it might get really cold over night...
Its all about PLAN Bs...
Roy Ken
My Posts are IMHO based on my experiences - Words in CAPS does not mean I am shouting
Roy - Carolyn
RETIRED DOAF/DON/DOD/CONTR RADIO TECH (42yrs)
K9PHT (Since 1957) 146.52M
2010 F150, 5.4,3:73 Gears,SCab
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2005 Flagstaff 8528RESS