damned if i know. My head says it should have a driver, but if i can get away without then i'd be willing to try.
The whole things a non-starter really tho, as unbraked trailers must weigh <750kg, whereas i'm on about towing a car behind a similarly sized car. its a one-off, and i know its technically possible, for recovery purposes to tow this much, but i'm on my lonesome.
EDIT: that link mentions ABar, which is an aframe. different thing to what i'm on about. Mine is effectively a metal pole (akin to a solid tow-rope) hence why i think maybe a passenger is required.