When we factory ordered our CY, the residential refrigerator was a no-cost upgrade...IMO, because it costs less for the factory to install a resi than the 2-way RV frig.
We boondock 8-10 months every year and had to run our generators twice a day to charge batteries during all months of the year. Yes, the resi is your major 12V consumer....by far!
After I installed our new batteries, house inverter, and solar system...our generators don't get the love that they need to keep fresh gas to them...lol. The CY's 5.5K goes thru it's 20 gallon tank once a year, and our 3.3K in truck is the main workhorse when an AC is needed for the pets (90+° temps).
We boondock in SoCal, Az....Nov, Dec, Jan months we DO need to supplement with the 3.3K because sun is at such a low angle that panels can't capture enough to be genny-free...the other 9 months/yr our gennys starve for fuel.
Do your research, and keep track of your own needs and demands for solar and battery requirements, then install. If you're a boondocker, you NEED to have the proper infrastructure to support your demands. If you're going to attach an umbilical cord to a pedestal like 90% here do, don't bother with solar nor batteries.
IMO, if you delete your resi for a 2-way frig, you will be sorry. Most of our off-roading families with their 40'+ SOBs can't stand their 2-ways and would rather have a resi in their trailers, (mostly Momentums).