I made my own hydraulic hole driller from a scrap hydraulic motor. Mounted it to a cage that's welded on to a JD QA loader arm plate. Loader curl hydraulic hose connect. Uses conventional 3pt augers. Mounted on 1 loader arm, I can see the designated hole target, my neck is just fine, gimbaled so hole is vertical on a side hill. Has reverse in case it hits something It can't pop out. Turns about 60 rpm with my flow rate. Light weight, easy to hook up, and can reach under a wire fence when replacing a broken post.
A trully cheap date.