How cold does it need to be to worry about RV water freezing?

We have a freeze warning here in the foothills of Northern California so I was concerned about my motorhome.  A 2006 Itasca Sunova 26P Class A.  It is supposed to drop down to 26 or 27 tonight and tomorrow night.  Continue reading “How cold does it need to be to worry about RV water freezing?”