heated basement( underfloor water system ) requires you use your onboard propane heat to keep that area above freezing. It is not hard or costly, just requires knowledge.
Run your propane furnace whenever temps go much below freezing. The ductwork heats your water system to protect it from freezing. . Yes,even when on the road .run your furnace.
When in a camp with freeze proof hydrants, disconnect , use the water to fill your onboard fresh tank use your pump for water.
NEVER TRICKLE ! to keep your fresh water hose from freezing, your waste hose will freeze then back up into the gray tank.
Do you want to wake to a flooded camper! Thats what youll get by 'trickling'