Newell Gurus

I understand Newell add Easisteer and Stabilride to the coaches in 2013 or so, I understand how booth systems work and i see Newell can ad EasiSteer to older coaches for around $6500.00. As anyone done this or have driven a coach with and without this system that can tell me how big of a difference it makes? I think Newmar calls in Comfort steer. How about the Stabilride system, is this also an upgrade you can add? Thanks for any comments 
Dan

What years can be retrofitted?

Newell told me that my 2003 cannot be upgraded....they said something about Silverleaf. I got the impression that the newer chassis (with steer tag) were required (mid 2004 and newer).

Dan,
During our search for a Newell Coach we looked at some 07s and 08s that had Easisteer. The 07 Newell Coach at Motorhomes of Texas has Easisteer.

Reese