Camping with full hookups in below freezing weather

I went last year and temp got to a little below 20. I forgot to disconnect my hose. Got real worried the next morning when I realized. Went outside and shut it off and disconnected the hose from the trailer. There was one large ice plug, and when I turned the water on, plugs kept shooting out. I got lucky, really lucky.
I suggest keeping a couple of gallons in your fresh tank for nighttime use and disconnect both ends of your hose. If your basements not heated I’d leave some lower cabinets open.