[Gegrad]

As a geologist who conducts remedies on old landfills, I would recommend #57 stone. It is a crushed rock, typically granite, that is more coarse than gravel, which is smooth from weathering. It has a nominal size of 3/4" -1" and perfect for making driveways that remain permeable. Our contractors use it almost exclusively for temporary haul roads. Use the bobcat to smooth it out and compact it some and you should have along lasting driveway. Too much larger and you will destroy tires; too much smaller and it will always be washing away or your rig sinking in.