My cousin has a new 4066r and saw a used MX10 rotary cutter. It's a 3-point hitch model as opposed to the new ones that use the drawbar. It's 2100#, the tractor is rated for 2500#. I know with the smaller 1, 2, 3 series JD way over rates the 3-point hitch capacity for what the frame will do. I also know that the 2500# is 24" behind the lift arms, and this mower is a lot longer then that. So I suspect it won't work, but figured I'd check and see if any of you have tried something this size. He also has iMatch which pushes it a few inches further back as well.
2017 2038r, 220r loader, 72" MMM, 66" EA Box blade, Woodmax FM-62 flail mower, Artillian forks, JD KBL 6' 1950s discs, subsoiler