The brochure says that Stabilization Level I is standard on 1500's and 2500's (Level II is standard on 3500's and 4500's).
The code CB7 provides enhanced roll stabilization with enhanced body.CB7 reduces body roll behavior through increased load/body center position. Depending on the GVWR, stabilizers are mounted to the front and rear axle and under circumstances with larger diameter. In addition, shock absorbers that have adapted characteristic are mounted.
On our passenger van, "Suspension for comfort and load protection" is also standard.
This suspension option offers increased comfort from the adapted dampening characteristics of the shock absorbers on front and rear axle. It additionally has an application of double-leaf parabolic springs with progressive spring characteristic which increase the driving comfort in unloaded vehicles. The spring is designed to be “soft” under low applied force, and becomes “firmer” when the vehicle is loaded, ensuring suitably firm suspension properties.
Feels good to me but I don't have anything to compare it to. In any case, I'm not anxious to take the new van down to Agile and get a new suspension. (Although I wouldn't mind a slight lift.)