The tracks of a dozer will always hit the high points. If the tracks of a dozer were always perfectly flat on the ground the pressure would be exactly as he said it was. This happens only in a perfectly flat world. When a 20 ton dozer runs over an area of clay or mud everything will be flat on the other side because if you have a mound sticking up at some point it will have half of the weight of the dozer sitting on it.
