I'm lost on why you fantasies this so much and don't just buy an RV or something?

Do you really hate driving that much?

I don't think this would change the world as you imagine it. I don't mind driving long i will just make sure i get entertainment for the purpose. Like an audio book. My wife doesn't say 'Lets go soemwere you can drive me around and i can finally do that many things in parallel'.

And plenty of family drive today with RVs while the parents are in the front and the kids are in the back. No one is showering while the parents drive. Do you know how slow Cars now would need to drive to make this suddenly that much more comftable than what we have today?

You would need to rebuild the car and streets to get to this point.