Power company here uses Asplundh for most of their forestry work on their powerline easements, right of ways etc. This was 7 or 8 years ago, it looks like a skidder or loader chassis, with a very heavy rotary cutter. It's limit is 8" trees, and the operator stated real hard dense ones like apple, they avoid, the hydraulic pump alone is $10,000, I had to have em lift it up and get a shot of underneath. The places they can go with these things, and the heavy brush and small trees they clear is incredible. I watched this in action and when I saw firewood size chunks of wood coming out, I stayed way clear of it.