For anyone interested, I saw a chipper atachment on Ebay for a Steiner tractor. I imagine its hydralic, but I'm not sure. It would likely require a different hydralic motor to match the PT's PTO.
Pics with the e-bay listing and those on the Steiner site suggest it is belt driven....so for PT, looks like a hyd motor and perhaps blower and small trailer would be in order.