I'm kinda new to the tractor scene. I just bought a JD 1070 tractor that is rated at 35 PTO HP. In looking at brush hogs I noticed both of the 6' models had the heavier class 2 3PH pins and the 5' units had the class 1 sized pins. Is a 6' unit too big for my tractor or can I convert the 6' model to class 1 to fit my tractor?