This is the custom built tractor I made. Its has both four wheel steer and four wheel drive plus a self leveling quick attach loader. The machine is powered by a small 18hp BS and uses a hydraulic drive system.
Here it is again moving (dragging) a very heavy 8 x 8' shed. The two people at the rear are trying to help lift using a pair of dollies. The tractor could have dragged it, but not without damaging our shed.
Here's yet another short clip of my tractor. Its not exactly a "industrial grade" piece of equipment but it beats a shovel. With only 18hp and a large 60" bucket I think it does quite well.