If you raise 180 bushel_acre corn, you better be prepared to slow down if you are running over 8% slope with a level land machine. The problem is the sieves all have the same corner that the stuff runs to. I have a lot of places that my deere will not level to and it goes to 16%. like onion farmer says, it is a lot safer, plus so much easier on the operator. GS 40 bushel wheat would be for sure different here..