I have several customers here in ND and MT that run on 50 and 60 series Deeres. Have a handfull of 42's on 9860's. Shoot me an email if you need more info.
I run a 30ft hb head on a 9750 for the last 3years its a good combo for the crops we grow wouldnot go much bigger for moving purposes and the machine can not handle any thing more j.d. in there great wisdom never powered em up enough takes lots power to fine cut the long straw we have i have more to say but maybe latetr