It appears that my L1500 doesn't have enough ass to pull large tree roots out with a subsoiler. I don't have the rear tires filled, and no weight on the front. Traction and the front wheels coming off the ground seem to be the 2 main issues. I think lift would become a problem if I had weight on the front. My approach was to put the subsoiler in the ground run in 3rd gear low range, and try to pull it up enough to break the root when I started to spin.