This is exactly what I do. My cabin is in a rural area that gets a lot of power outages, and it also happens to be < 10 min away from a supercharger. When I was getting quotes for a home battery backup system, every other option was astronomically more expensive than the cybertruck. I don’t know why adding wheels to the battery pack makes it a lot less expensive but I’m not complaining. It’s good to have an extra vehicle I can use in the event of an emergency as well.