just a thought for you to help in your design. When we lived on the farm, we made a homemade "thingy" to do fencing. simple.....use a rod to go down the middle, turn a used disk blade upside down(bevel up to the roll end). This went on the hitch. The neat part that dad designed went on the 3ph, and another disk blade on top of the roll, then lower the 3ph with this thing made of angle irons that hooked to the arms, and the center arm, and lowered into the roll of material on the hitch via a hydrolic cylinder. This worked with everything from tall horse fencing to a roll of barbed wire. When we sold the farm at an auction, this thingy brought in the most of any attachment that we had. Even more than the sidewinder(sidewinder was like a giant rotor tiller with planter boxes on it too. 1 pass through the field did it all. Didnt much like cleaning the twine out of it after planting season tho after we feed our cattle in the fioeld all winter long!)