Amped 28FS Sway Issues when towing....need help!

big buford wrote:
Air bags should be used to help control the bounce (up and down) while traveling down the road. Start at 20 psi and add 5 psi until you get a ride that feels good.

I respect your opinion (usually) but this statement has me very confused as it goes against everything I know about suspension, which I admit isn't all that much. Please explain as my thoughts are the shocks are the only thing that controls the bounce. The bags carry the load.