The only engine I've seen that had anything like that was in our old antique engine club. One member had an 1908 Fairbanks Morse that was 20 Horsepower, 4 foot wide dual flywheels, and an enormous 7" piston. One of those old engines that was used to hook up belts and run machinery with. He hauled it in on a trailer. It was also a hit-and-miss engine which meant it only fired every 4-5 revolutions. So it's be running along then suddenly fire, which would almost make the trailer bounce. Looked something like this:
