Don't know about the question, but is it possible that Deere tends to have a little more problems with power hop!  I have a Magnum with front suspension and around here I thought most had the option, but I have never verified that.  I know the Deeres without suspended front were very prone to power hop and owners trading out of the 8300-8400 series probably wanted a remedy for the problem and were quick to jump on the ILS bandwagon.  I have seen numerous of the older Deeres around here bouncing through the field.