My truck (2004.5 Dodge Ram 2500) is notorious for having “soft” OEM springs. Unlike the 3500, there is no upper overload spring. Carrying 2,000# was enough to compress much of the available stock leaf arc. I considered adding stable-Loads; but in MHO all that accomplishes is pre-mature engagement of the (stiff) bottom overload spring. I did install air bags but agree with some others this is really nothing more than a height adjustment/leveler, it can and will take some spring load off but can lead to increased sway.
I ended up adding Supersprings and have never looked back. There is limited adjustment in terms of setting pre-load and I set that to minimum. Yes, they are stiffer when unloaded but not terribly so; and I immediately benefitted from the additional spring arc available, as well as reduced sway. I hardly bother with the air bags anymore.