Maybe his ground was flat enough he didn't need to worry about height adjustment Charley.
Drive speed may have been an issue though. Years ago, when we still had some red cedar that would make roofing shakes guys were splitting the knots out with a splitter made from car or pickup axles. They took one rear wheel and attached a Pitman arm to it which converted the rotary motion into linear. That would push the block into a splitter knife. To make it work you simply stepped on a brake pedal that stopped the other wheel and caused to limited slip rear ends to transfer all the power to the wheel with the Pitman arm. They were pretty bulky as they usually utilized the old vehicle frame but they worked pretty well and they were fast. Sometimes that redneck technology turns out some pretty good ideas and shows an impressive level of creativity.
Someone I consider a master woodworker once told me that a master woodworker is not someone who never makes mistakes. He is someone who is able to cover them up so that no one can tell.