</font><font color="blue" class="small">( Here is the rotary hoe. I measured it and it is 15'. Not sure what I am going to do with it but it was thrown in the deal. )</font>
That looks like an overgrown version of what a friend of mine uses for an aerator. If you have the time, ability, and desire, you might be able to chop it into 3 pieces, weld up 3ph lifts for each, and be able to sell three 5 foot aerators.