I knew a guy who moved 7 or 8 large (for moving) 20-35' pin oaks. He used a backhoe, digging out around the rootball, while leaving it intact. While this was successful, and the trees did very well, it completely wrecked all the surrounding land.
I know it's not ideal to move trees this size, but if I do, is there a less aggressive method, and what tools should I use?