We're in AZ with temps well over 100f do we always use propane to keep it cool. I wish they had an on/off switch on the dash. I know not to bring an open flame to the fumes of a gas station so we pull over before, then pull into station, then have to leave, pull over and start it back up. A chore especially when pulling a boat. The switch is on my to-do list but low priority. If I knew specifically how to wire it, or may be done; but, I need to also research.
Love my 2001 Jayco 313H class c though. Best RV I've owned.
I can't remember anyone doing that mod. Great idea!