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My 2 cents .....
The cost of a couple of extra regular batteries to power a residential fridge should be much lower than installing a propane fridge. Additionally, the reason many manufacturers and owners are switching to residential refrigerators isn't just because of available larger sizes.
An example of this is the 10.7 cubic foot residential fridge that is an option in the new compact diesel pusher by Tiffin. I'd have to guess that option is not driven by size, but rather by it being compressor cooled like all residential refrigerators. That compact range of size seems ideal for smaller RVs that have limited room in the 2-foot wide by 2-foot deep by 5~6 foot high -- very common.
A quick check shows energy-efficient residential refrigerators of that size use just less than 1 kW-hour of electricity per day, so they should be able to run for an entire 24-hour period on 2 fully-charged average-size RV batteries; provided they are in good shape and nothing else is running. Given that 2 batteries are often needed to power other items anyway, then 4 batteries makes a lot of sense if powering a residential fridge for most of a day.
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