I am in the process of building a pto powered trailer for my speceffic tractor.
Mine doesnt have live pto. So when I push in the clutch the pto stops spinning.
The trailer is based around the rear end(transmission, pto, diff, final drives, and wheels of an identical tractor). I turn the trailer backwards and connect both pto's together. As long both transmissions are in the same gear and their pto's are turned on the trailer tires are powered. if I turn off either pto the trailer tires are freewheeling and the pull tractor can be put in to any gear.
The idea probably wont work for you(you probably have live pro and dont have an identical tractor laying around for parts.)