I'll bet that works great until he has to shell out the $$$ for rear end repairs on his truck or he has to go to the ER with a busted arm because he got a glove or his clothing caught up in the mix, hee...haw,. Of course, I have seen model T's with the back end jacked up running saws and pumps. Same thing I guess only this is using a helix as the driven machine.
I remember seeing pictures of one like that in the 1950's that someone had made utilizing an absolutely humoungus steel wheel off an 1800's version of a steam tractor, in Alaska. I wasn't all that terribly old in the 1950's, but even then I remember thinking how easy it would be to lose a hand (or any other body part)!!!