Gas Power auger recommendations

Just wondering if you got a lot of rock? I rented a skid steer with an auger to drill some holes for gate posts, thanks to the auger skipping around thanks to the rocks I have 36" holes........


LOL 36" holes....gonna need a heck of a lot of concrete!! Not a lot of rock here Doug, but skid steer and an auger would be about $300 for the weekend plus fuel...then I gotta get it done in the weekend(both holes for deck and for the fence) I cant see that happening....