Replying with “None, Morgan 3 wheeler or BMW Isetta” is too easy. You have to choose one of these. If you have another answer it must have 2 wheels in front, one wheel in the back. Not the other way around.
The Unisport was a bat-fucking nuts kit you could get for a brief time in the 70's that allowed you to drive a car while your friend rides a motorcycle presumably hanging on for dear life behind you.