Take a look at the Super Split log splitters. My father bought one of these over 20 years ago. He used it one summer to split 50 cords of wood ( brought in on trucks). You can get an electric or a gas powered version. They are fast, simple, reliable, and easy to use. You could probably even rig one up to run off the tractor with a hydraulic motor. In the 20 or so years that he has had this splitter I think the only problem he had was a bad switch or something like that.