Air Bags.

I've had airlift and firestone on two different trucks, both rated 5k lbs and double bellows. The airlifts were on a 97 and it was a drill kit... I drilled the holes where I wanted them. My 03 is the no drill kit and they replace the rubber stops. Both work great. I use them to keep the back end up and help the ride when towing. I joined them with one airline to keep airing simple. I don't know if separate airlines would be any better for sway than the seperate springs that you already have. I think the best thing for sway would be a sway bar. Craig