Just got back from 2500 mi. trip, was on while on the road, shut off while fueling only. It will all come down to personal choice and what you are comfortable with.
2005 Dodge 2500 SLT+,CTD 610,Auto,4x4,LWB,QC,Leather
LCD/DVD,custom surf racks,Hellwig S/B,Rancho 9000's,Lifeline AGM,PD 9245C
2,750 custom overloads,no bags no problems
One Beautiful Wife,4 year old Son & 9 week old Son
My refrigerator has 3-way power, and I never use 12 volts. It doesn 't produce enough BTUs to cool down a warm refrigerator, and barely maintains the temperature if it is cold enough when you start driving. I also don't trust the wires to be thick enough that more power goes to the refrigerator than is wasted as heat in the wires. And, if I stop the engine for a while and forget to turn off the refrigerator, I might come back to a seriously depleted house battery.
Tom and Lynne
Tom is an Electronics Engineer, Lynne a retired teacher.
2003 Foretravel 38' U295
metrobruce - I think you are getting some very logical responses. Fortunately, there have been no post about the sky is falling. No question about it, do what you are comfortable with. Put you thought energy into driving that rig safely, and appreciate the joy of camping.
I turn ours on the day before we leave, and off once unloaded upon return. If I hook up shore power it automatically switches to electric.
2010 Ford Expedition TV
2010 Outback 230RS Toybox, 5390# UVW, 6800# Loaded Not yet camped in Hawaii, 2 Canada Provinces, & 2 Territories I can't be lost because I don't care where this lovely road is going