Short video of a converted Tonka Semi tractor. I helped a buddy with the new motor and mount for the drive. We started out with a servo driving the rear axel but is was not liking the load and would get hot and chew through a battery quick so we changed over to a esc and gear motor. Still a truck slow on a 2S lipo, but the esc is a cheap one that won't put up with a 3S.
https://youtu.be/z2pTR-GRqd0
Jim