We have several members in our RV club that have residential fridges out of the factory. Two batteries are specific for the fridge, but you will have to start the generator if dry camping in the morning for about two hours and then in the evening the same thing. We dry camped at Furnace Creek for the 49er days for four days and that is what they would do.
I have the Norcold 1200 LRIM so I did not have that problem of starting the generator twice a day because my fridge was running on propane. I started my coach for one hour in the morning just to replenish what ever needed on the batteries and at the same time we were making coffee and other uses of the microwave.
But yes you can dry camp with a all electric coach as long as you have a generator or solar panels.