My Wood-Eze processor is PTO driven, place the PTO pump on the tractor stub and chain it down. I’ve since mounted the pump solid to the processor and use a short PTO shaft for the power connection. I’ve snapped a PTO stub once in the past, and the funny pull from the chain I think was causing the pump housing to flex and blow seals.
Other than needing a tractor to run it, I don’t see any real drawbacks. I also run an ear corn conveyor to load the truck with the hydraulics from the tractor. My uncle has a Ford 9N he’s tried to run it with, killed it dead, his 66 gas Oliver does a little better if you baby it, my Super 88 diesel runs it just fine, I prefer to use my 1755 or 1855 Oliver and slip the PTO selector into 1000rpm and just run the tractor at half throttle.