Have you ever used a hydraulic auger? I picked up this groundhog auger from Home Depot’s rental department a few years ago, and it’s been worth its weight in gold! 12” x 36” holes in rock and root filled dirt takes only a couple of minutes. So far we drilled 15 piers for the porches I’m adding to the outside of my house, and it’s taken a fraction of the time that hand digging would have. I actually prefer this machine to a mini excavator or other machine mounted augers because the big tires don’