The Tigercat scarifier is a skidder with a special rotary plough on the back. It is designed to break up the surface of deforested land for trees to re-grow.
Here is a picture:
https://www.google.ca/url?sa=i&rct=j...71398748070060
I will be making the model out of the very thing other forestry machines harvest, WOOD! Updates combing soon.