I am wondering about towable aerators. I looked at the specs of the classen/lesco, the bluebird, and the turfco and all of them have a larger hole spacing than their walkbehind aerators. Why is this. Do you have to make two passes with a tow behind to get the same results? Or are the holes larger and deeper to make up for it? Does anyone make a towable aerator in the $1500 to $2000 range that has a core spacing like the walkbehind ones. About 3.5" x 6". ps: I did the search so don't ask.