I recently bought a Kodiak 5-1/2' box blade. I figure that wouldm be heavy enough for my tractor. 30 HP T1510. Years ago I used to have a HD 7 footer on the back of a 50 HP farm tractor, but I couldn't remember about the cutting edges. To smooth my stone driveway, I will shorten the top link, so when I back up, the rear blade won't dig. Thanks.