I will be fencing appx. 50 acres, about 1/4 will be 4 board wood fence using 4x4 posts. My tractor is a Kubota M9000 (90 HP). Do I need a PH digger that is heavy duty, are there different types of hookups, etc. Any advice would be appreciated. I have looked at the Leinbach, Speeco(?), and a Bush...