The only exception I’m aware of to spending lots of money on a high-capacity lithium-battery electrical system in order to eliminate the generator is the Coachmen Cross Trek line of motorhomes.
They seem to apply the cost of the typical Onan built-in generator towards a Xantrex 3,000-Watt inverter and much larger AGM battery. For 2021 they appear to have added extra battery- and solar-capacity options while keeping cost competitive.
That seems like a great and affordable middle ground for those who drive often, or camp in mild weather, and or mostly overnight in campgrounds with shore power. No doubt some RV owners use their generators a lot of hours, but many hardly use them much at all.
__________________
|