I have 12 volt heaters for all 4 tanks. I assume I run the heaters while on the road but what about the water lines? Can you run the furnace while traveling? My tanks are in heated spaces so if you can run the furnace why the 12v tank heaters?
I'm back to the original question.
2012 F150 F/X 4, 6cyl EcoBoost with Max tow pkg
2013 Rockwood 8280WS 5th wheel
2006 Sunline T1950
2004 T@B T-16
Tanks fill cavity so no room for warm air to circulate. Heaters are underneath tanks. They are only about the size of a sheet of paper but heat rises to tank. Furnace would also have to be on to keep trailer above freezing.