I've talked to many farmers who have farms near different terrains near mountainous areas, especially out west and a piece o equipment is almost a necessity. They say that the freezing ground combined with the water in the ground actually pushes rocks to the surface and many years or every other years they have to go back to the fields with crews and pick up rocks that could seriously damage machinery. This thing makes short work of it. I'm impressed with the out of the box thinking it took to design this.