I have firestone airbags, an action van 3 inch lift (prior owner) and bilstein shocks. I see fairly little improvement from the airbags. They create a bouncy ride in my case for anything over 55 PSI. Do little to nothing for sway. Your experiences may vary.
The biggest improvement in handling in my case was adding the Helliwig rear sway bar for RVs.
History: '08 View, '05 Chinook, '01 Jamboree 24D, '78 Apache Popup, 81 Komfort Tlr,
84 Mazda B2000 'w canopy,
Tent from wedding shower in '96