Go to this link
Fleet Showroom | fleet.ford.com
On the right side there is a download for the Ford Fleet Class A motorhome chassis brochure, 2014 year. Compare the suspension upgrades with your target chassis.
My understanding is that it is a difference between more of a truck chassis and the newer class A chassis. Mostly about the suspension and also about the hp of the V10.
I think you are right around the time that Ford came out with this Class A chassis. Personally, I would want the newer chassis and newer hp V10.