Hi Nighthawk, and welcome!
NOTE: The fridge doesn't run on battery, only the really small ones do that. These run on 115v and propane.
We leave the fridge on auto all of the time, so it kicks on whenever it gets too warm. Try to always put already cold stuff in the fridge, so it doesn't have to work so hard.
If you have the MaxxAir roof vent covers, just leave them open, and they will pull the cool cab air through the motorhome. We leave the bedroom and bathroom roof vents open all the time. It also helps to leave the cab-over bunk completely in place, so the cab air is contained and directed through the coach.
We travel with 3 dogs, and two stay on the couch... I seldom get to use it (sigh). One is a 135 pound Newfoundland, and they stay plenty cool with just the cab air.
If it gets REALLY hot, you can run the gen-set while driving, and turn on the roof air conditioner, costs you about 1/2 a gallon of gas per hour to run the generator.
We also leave the thermostatically controlled Maxxair vent fans in the "Auto" setting, so that they will come on if it gets too hot in the back.
Have fun and camp safe!
2016 Redhawk 26XD
Me, Dear Wife,
2 Bluetick Hounds
1 Newfoundland / Black Lab Mix
1 Cairn Terrier