Ironically, as climate change effects become more and more prominent, going with a RV route is looking more like the best possible option for the future, cause you can just pick up and leave when bad weather comes.
That's fine when young and healthy, but when you're older, have several recurring doctor appointments and some mild impairments, a home is a lot better.
Not saying it can't be done, after all there are nomad populations with elderly people who live on the road. But they usually have a support system that travels along, too.
what's the plan when fuel shortages start happening and your RV can't be kept rolling?
Also, with a bigger battery comes higher limits on how fast you can charge. If you have a 300kWh battery you should be able to charge it at 300kW all day long.
That said, it doesn't really exist since there is no market for it at the moment. RV sales aren't exactly high, so the niche for EV RVs is even smaller. Plus there's no real infrastructure out for it now.
I suspect once EV Semis become more mainstream we'll see that trickle down to RV users. They can charge at the same place a semi would charge at.
Also, there will undoubtably be hybrid options where you can have a multi fuel generator charging your batteries.
https://www.ford.com/trucks/f150/f150-lightning/2022/#towing...
It is not unreasonable to work under the assumption that temporary petrol shortages become a annual or semi-annual event in a future where the gulf coast is hammered with ever more frequent and powerful hurricanes.
This is an area where small, distributed solar panel arrays and batteries (like on your house) can be much more robust. It's a lot harder to destroy thousands of small solar power systems than it is to take out a pipeline feeding an entire city.
But realistically, hybrid powertrains, or even simple multi-fuel generator charging will make this a non issue.
Provided you're lucky enough to run out of gas in a location that your RV won't be a nuisance. And if you're in hurricane territory, an RV is not functionally equivalent to a house.