If you run your furnace at night, The radiant heat and enclosed under belly will keep everything from freezing. You will have to disconnect your water hose from the city hookup if you are going to supply water that way and just use your fresh water tank and pump at night or you can buy heat tape for the external hose, but everything in your trailer will be fine.
Jason & Wendy
2014 Ford F-350 Lariat 6.7L PSD
2015 Keystone Montana 3711FL
B&W Patriot 16K Fifth Wheel Hitch