The auger in the pics is a 9" and if the ground is wet, I dig about half way down and then raise the auger to clean out the dirt and then drill the rest of the hole. The weight that far back is more of a problem than running the auger, the 2660 should run a 12" with no problem, just the weight of a full auger load of wet dirt on the end of that long pole may be more than the lift will raise, just drill part of the hole and lift it to empty and then drill some more.