I run my JD 400 with a 30 PTO hp. Although I only do it when my big, 40 hp tractor, is tied up on something else. I grind ear corn although at my age I don't get in a big hurry shoveling it in. The book shows a 4020 hooked up to it.
I don't know the model but my BTO neighbor runs a fairly new New Holland with a 50 hp tractor. He has lots of bigger tractors sitting there so it must run it OK. He grinds shelled corn with it.