Couldn't be arsed to watch more than 10s of the Carver video, sorry, but with that huge caveat: it reminds me of the BMW with a roof. I think it was BMW C2? That had two wheels rather than three, but it had a roof and a roll cage and a seatbelt – UK law still required a helmet, many countries did not – despite all those it was still perceived as a motorbike rather than a nimble car.
The other thing the Carver reminds me of is a fancy mobility scooter I saw last week. That had four wheels, I think, so probably didn't lean, but was slimmer.