Check out this:
http://www.chromjuwelen.com/de/network/228-blog-hemmings/112884-from-three-wheeled-trucks-to-model-t-tanks.html
That's really neat. Looks like there are two pull handles instead of a steering wheel to work the tank tracks.
think I've seen it all now! Pretty neat.
"You see commander, no fuel pump, oil pump or water pump to fail when a bullet strikes it"