Regarding battery data, particularly where we stand on cost and weight that could affect the future of motorhome house electrical systems, this article has some interesting facts.
https://www.extremetech.com/extreme/...l-quick-charge
The estimate that automotive lithium batteries only weigh around 15 pounds per kilowatt-hour (kWh), in sizes of 50 kWh or larger, is interesting and very important for comparison. Basically a 50 kWh pack should weigh around 750 pounds. "If" it could replace 4 lead batteries and a generator (particularly a diesel generator) the weight penalty wouldn't be that much compared to motorhomes in the 20,000-pound or higher range.
Regarding cost, one analyst had the cost as low as $100/kWh, but even at $200/kWh, that's only $10,000, not that different from the cost of some diesel generators, and only a little higher than cost of gas generator plus standard batteries.
The major bottleneck seems to be difference between wholesale and retail battery cost. Tesla's cost is already lower per kilowatt-hour than we'd pay for AGM batteries at retail. And when much greater cycle life is considered, lithium is a lot lower in cost.