I've the grader but here is the issue. I bought this to help a local non profit boys camp maintain their one mile dirt road in Maine. Yes the road is rough but it is gravel with a few rock lobsters mixed in. So some rocks are a foot round up to 2 feet round. The grader with the times down 3 inches keeps pulling the ground tips off. The dealer said its a wear item. So when the tip is off the scarifier the scarifier shank wears down in no time so I need to replace that. $15 for a tip and 50 for a shank. All times 5 shanks pretty tough each time I use it. Anyone have better luck? Thanks. Mark