You are leaving a lot of information out. Does it have the 28" rear tire or the 36" rear tire. That in itself will make a 2 foot difference in width. Then are tires loaded or do you have iron weight on. A 38" wheel with a dual tire and fluid in a lighter finnishing disk you could handle a 12-13'. That setup would be equivilant to the Ford I had. Now if you have no duals and no weight with the 28" tires you are maxed out with an 8' unit. The way the tractor is setup is first consideration, next is style of disk as they varry considerably in power to pull sane size and depth you are trying to cut is a big factor.
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