Dan, the StableLoads are a product sold by Torklift. They aren't that expensive. I think I paid around 125 for the kit and another 100 for installation. They are basically steel fillers that go between the leaf springs and the overload spring. They disengage fairly easily to soften the ride when there is no load. That's why I'm not sure how they would work with airbags, but they do have a pretty good web site. If you decide to go that route, I strongly suggest you pay someone with a lift and a bit sharpener to do the in stall. I tried the DIY route and gave up quickly. The young man that drilled the holes for mine flat earned his $20.00 tip. Good luck.
