a plug in heated supply hose is easily acquired and worth while -->
but you also have to know your rv in that which areas GET cold
just like at home, you can leave cabinet and interior access doors open to allow the warm air to circulate... but it's the long periods of below freezing that you need to worry about, not necessarily the overnight dip and then warm up...
Winter is our favorite time to rv ! crisp air, campfires, quiet - wonderful
And with satellite tv we can still watch our SEC football !
in fact we are leaving today for the weekend, and have another trip planned for November !