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I agree it's very important to first figure out how RV will be used. And what makes the best solution for each owner so complicated are all the different sources of energy that can be used. There is shore power, propane, solar, engine alternator, etc... And to smooth out peaks the use of batteries is critical, especially now that the RV trend is shifting towards more electric. In any case it seems you can't go too wrong with more battery capacity (except cost and weight).
I was recently reading about a new EarthRoamer built on F-750 4X4 chassis which incorporates 25.3 Kilowatt-hours of battery capacity, 2.4 Kilowatts of solar, and 2 X 3,000 watt inverters. For now the cost of this much technology can only be absorbed by mega-expensive motorhomes, but the cost seems to be declining fairly fast so it may filter down over the next decade or so.
I'm personally looking forward to the day that battery capacity is inexpensive enough to make an all-electric motorhome without a generator practical for us to own. We are almost there now, but lithium batteries need to drop in cost a bit more. And it would also help if more OEMs offered engine choices with second alternators. They are already options on M-B Sprinters, RAM trucks, and Ford diesels, but no mention yet on Ford RV chassis like F-53 or E-Series.
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