Gas Power auger recommendations

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....
I drilled 30 holes in my neighbors yard, with very little rock, in under 2 hours. He got nice clean 18" holes, close to 48" deep.......