If you use down pressure on a plow you are lifting on the rear of the tractor. This is not good for traction. A properly adjusted plow should pull its self into the ground and control draft without down pressure or extra weight. Plowing was done for a long time behind horses and oxen without weights ore down pressure. When I plowed my garden with a David Bradly two wheeler an old farmer I knew stopped by to enjoy laughing at me Then ask why I didn't set it up better. He spent a few minuets tweaking the adjustments and cut my physical effort down by about 3/4. I learned a small amount about setting up that particular plow. There are many different variations of plow that need to be adjusted for many different variations and conditions of soil. That old farmer was 76 years old at the time and still working the same ground he worked when he was 10. He said in another 60 or 70 years he expected to have it about figured out. Since getting 4 wheel garden tractors I haven't had the opportunity to use a turning plow with one. I can understand the competition or challenge of the plow day. Don