I'm looking into getting a large EV so I can move off of a propane generator. A generator needs service, it will cut power for 5-10 seconds while it starts up (so your PCs and whatnot will power cycle), and it's loud.
Also, I built it myself so the labor costs aren't included but I am about $8k into a system (4kw of panels, 6kw inverter, 15kwH battery).
I personally wouldn't be able to make vehicle cheaper than having no grid tie. I get that the costs are different once you include labor. Also I am on 40acres so the panel set could be ground mounted.
But to make something commensurable with a propane home-powering generator seems a lot more do-able.
The quiter part makes sense, but there are a lot more practical solutions to that too.