Rear or all four air bags are also another thing that will minimize sway. The air bags also have the ability to adjust the air pressure according to conditions. I have four corner air bags which allow me to continue driving in some fairly high cross winds just by airing them up to 90 PSI. When the winds are light, I lower the pressure down to 20-30 psi for a smoother ride. They also allow me to raise the rear end of the coach a few inches when I need extra clearance to get in to my steep driveway. All of this is done with a push button on the dash that can raise or lower the air pressure as I drive. After using the air bags for 50,000+ miles, I have no need to add SumoSprings or a track bar with the air bags. This is on a Workhorse W22 chassis so the air bags may or may not do the same thing on a Ford chassis.