Improving harsh ride?

I have the Firestone airbags on my E3500 Chevy chassis. I measured the bumper height before loading and then adjust the airbags after loaded to bring it back to the measured height. I dont think it gives me any softer a ride but it stops the tail from dragging in swales and helps stability in turns.
I think soft ride is a very relative term when applied to a 1 or 1.5 ton truck on a rough road loaded with breakable items. I just wish people would not get so upset with me when I slow down on those sections.