I have a bunch of 1 1/2 inch rock that I need to pick up. Do they work? Truck driver had a screw up today and tailgated about 15 ton of rock down my field road, and now I need it gone. How do I do it. Rock was spread very thin, 15 tons over about 1/4 mile road. The road is a dirt road, covered with grass, and is hard packed. Never used one before, and don't know if it will work. What do they rent for a day?Thanks!