The GR100 weighs 85 lbs., has 15"- 19" adj. shank, shear bolt protection, and optional shovel. Most of the JD dealers around here carry Gearmore. I paid $225, incl. tax and freight.
The 4310 isn't here yet. I recently updated my profile, and included the tractor, as it is due this week. I don't anticipate any problems pulling the GR100.