[notanlines]

Ed, I'll be blunt. You're putting too much thought into this thing. Run with the propane on. Take ten minutes and do a search on this site for comments on who does and who does not run with propane on. 50/50 won't be close. I'm betting it is closer to 80/20. By the way, how many times in your life have you picked up the paper and seen headlines concerning "RV burns to ground because of refrigerator fire.....?"
And, yes, we also had a three-way Dometic in our Hi-Lo. It would have taken four 6 volt golf cart batteries to keep up with that thing.