The OSTPA Pro Stock pulling class is always one of the cool classes to watch. This John Deere 4560 is a good example of that. The class allows a number of modifications that allow the built tractors to perform well and be real cloud…err crown pleasers. If you haven’t ever been to one of these events, I recommend that you check it out. Just don’t drive your Prius to save fuel. It wont make much of a difference in the long run.