Ram 2500 (coil spring) versus Ram 3500 (with opt air ride)

Well I finally got to see this airrdie setup on a 3500 SRW Ram and it looks more like helper bags than actual suspension. The amount of leaf springs looks close, I didn't have time to count and measure thickness between one with and without the air. I thought it was more like a highway tractor setup with the airbags doing all the load, but does not appear so. Not sure if it's worth $1500 CDN unless your loading up to the max in payload.