When I was in college in the 70s I worked for a man who had a Double A Ford truck that carried a tilt-up well pounding rig with a wedge where the hammer would be. When we got to the customer's site we would jack up the left rear and take the wheel off. A drum was bolted on to drive a 4 foot circle saw to cut up the wood. After cutting the wood a PTO was engaged to drive the well pounding rig in a verticle position.