With the air bags you can pump them up and almost eliminate most swaying. When we are traveling in the Great Plains and it is windy, I just pump them up to 80-90 PSI and I have felt comfortable driving with gusts around 50 MPH.
The downside of that is that when the air bags are pumped up, the ride does get a little harsher and I only do that on smoother interstate highways. Once we get off the highway, I can lower to air pressure and regain the smoother ride.
With the W20-22-24 Workhorse chassis, it comes from the factory with front and rear square tube anti-sway bars that are attached steel to steel, so there are no rubber bushings to wear out or to get sloppy.