A few years ago I was towing a car with knock-off wheels, backwards on a dolley. Didn't know the possible consequences with left hand threaded spinners at the time. Made it 30 miles before the wheel came off on an overpass. Felt some heavy shaking and saw the wheel rolling off to the left, then go over the railing. Pulled over and looked for the wheel, then, and a few days later. Never found it in the thick summer brush, and it was a pretty valuable, although unrestored Borrani wire wheel.