Batteries on submarines are a different universe - such as unlimited budget, the spectre of chlorine gas and SIZE. A nuc sounds like something huge but only the Virginia Class attack vessels do not employ enlisted hot-bunking. The newer Sea Wolf class had to return to hot bunking.
Don't know about anyone else but I don't have a billion dollar budget. Nor would I employ any battery bank as an EMERGENCY BACK UP like those nuc submarine batteries would be. Exide Limited, INDIA, is today's PRIME VENDOR for conventional submersible flooded lead acid batteries.
At least a thousand REAL WORLD examples of full term RV use would be needed to establish a baseline. Folks grouse about "Whaddya mean I simply can't push a button and walk away?" kWh rendered in full lifespan data needs to be collected. You can bet your butt manufacturers like Tesla and vendors of submarine batteries worth more than your lifetime"s earnings employ automatic management systems that for instance intrinsictly know lithium idiosynchrosies and bow to them.
A realistic number of real world RV examples is needed. A new style battery - one that costs as much as lithium will not be plug and play entertained. My gut hunch is that this technology DEMANDS more auto control to maximize highly touted service life. This needs to be ironed out. Tesla can afford a CPU to do this. Can you?
The proof will be X number of full lifespan RV USE examples. I provided quite a number of proofed examples that did not agree with vendor expectations. Lithium is far too expensive to relegate to novelty status. I keepbsaying this --- Time Will Tell.
