I run the dash ac on max cool mode and adjust the fan speed accordingly.
I will next start the genie, and when it comes online, switch the roof ac "fan" from auto speed mode to high and set the roof ac stat to 70.
If needed, I repeat step #2 for the rear roof ac. Keeps the process simple and efficient as you are cool and your giving the genie a workout which always preferred over letting it sit.
Works every time. Fuel consumption between 1/2-3/4 GPH. BTW, you have a rv fridge, the genie also lets you run it on ac instead of lp.