How much should I charge to "rent" me, my tractor, and my rock picker? The other guy will provide the fuel and will mark his land. I originally thought I'd rent out my rock picker, but I'd honestly rather be the one using it to clear the field. I got it used, but it still cost a pretty penny and I don't want it run into the ground. Should I charge by the acre or by the hour? His field is pretty rough. It will take time to go over it. I like the guy though and he's always dealt fairly with me. It's a Kongskilde Stonebear rock picker. I can't find any rental numbers online that I could use as a starting point for this one.