Our fence installer put in 8" posts for corners, using the pounder device. It attached to the rear of his JD tractor. I also specified using double bracing posts for those corners and gate posts, so we never did use any cement. Fence is high tensile with 8 strands, so it is under a lot of strain, but no moved or loosened posts. Sometimes the wire gets even more stressed with coating of ice and high winds, like last week. Those corner posts handle the load.
We have seen poorly, improperly installed high tensile, only one brace at the corners and gates, which did come up, loosen with time. Same soil as ours, but they were cutting corners, “saving money”, so it came back to bite them. Another “wrong” they did was only having 3 strands of the high tensile wire, not recommended by the inventor of the system. Had to fix posts later on.
I know folks who just hired fence companies that came in to pound in the posts, then folks installed the wire or boards themselves. I loved hiring the whole job done, no frustration, no arguing. One of our best farm investments, paying the fencing specialists to do the job right!
You might search further afield for fencing contractors. One company was over 80 miles away, while our other one was only about 60 miles away. No one close by did the post pounding option, so we had to use other folks.
