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

The coils ride and handle noticeably better, and I think part of that is the rear swaybar. The payload difference between the two is substantial on the diesel trucks due to the GVWR class limitation, but the axle rating is only 500 lbs lower on the 2500. In terms of real world performance there's not much of a difference. The biggest difference may be the TPMS on the 2500, which can be a hindrance in setting the PSI where you want it without the idiot light going off (or getting the trigger points reset by a dealer).