I posted some time back how difficult it was to be off-grid without a propane fridge. With a 120v only fridge it is a "nail-biter" if you have a few days in a row with hardly any solar, and no generator.
This was in a truck camper where there was no place to put a generator, limited roof space for solar, and limited space for batteries too. It was an older 11ft camper with a busted 3-way fridge, so we tried a little 120v one. Finally had to go back to a "proper" 2-way and use propane off grid. What a relief to have the propane again! No more praying to the weather gods to make the sun come out on the Wet Coast in winter.
It is different obviously in your 40 foot rig in California sunshine where ice cubes are important. :)