We use our generator at least a few times on every major trip.
One episode when we were in Utah near Arches and pulled over by the river to prepare lunch, it was close to 100 degrees, no breeze, no shade. We used the gen to run the AC for an hour or so, then on our way. Another similar time, used it on a steamy morning while dry camping on the outer banks. Most recently at the Albuquerque Balloon Fiesta where we were dry camping near the field.
We haven't had any problems getting the propane refilled on our Sprinter. The propane tank's already there and in use anyway for stove, furnace, water heater.