I'm working with several hunting buddies on food plots. Unfortunately our property is very rocky. We would have difficulty plowing because of rocks. Probably could simply disc several times to loosen up top couple inches. How about a tiller run shallow. That way it wouldn't hit as many rocks and if it hits one, it should kick the stone out rather than break the tiller. What happens if you hit an imbedded rock too big for the tiller to break loose?