52 - Rear Air Ride

So here we have a 2006 IC FE with a rear air ride set up. This style flexes so much better than the system with the cross beam that links the air bags together. So it allows this bus to have a much more smoother ride allowing the body to remain level while the axle does some serious moving.
Also, this is when you can hear that awesome IC hiss from the air ride. Other manufacturers have air ride as well, but none hiss as loud as IC.