I have a massey 1532 with a tire width of 58 inches. Trying to decide on what tiller size to go with.plan on a king kutter tiller...options are 5ft (60 inches) or the 6 ft (72) inch tiller . The 5 ft would probably cover tire tracks but is that cutting it to close? Not sure if 22hp pto is enough for the 6 ft...soil type is generally good with little clay at the 7 inch depth...HELP me decide