We built this retaining wall with 12"X12" rocks ranging from 2' to 8' long. The longest rocks weighed in about 1300lbs. It was a great project. We built the rock tongs and they worked great. The final wall was 6' high and the DK50se handled the job well. We used the tractor for every part of the job from setting rock to backfiling material. It even dug out 110' of the 220' wall down to rock. That half of the wall is 7 rocks high.
