I guess I disagree. The benefit to supplemental airbags is they increase spring rate much faster than leaf springs, and the higher CG will make this happen faster and end up more stable. You need to have adequate air in the bags thou, meaning some load needs to be on them. I guess it's just how you want to run your suspension.
I personally think and a leafs, lower stable loads, and supersprings are bad ideas for the life of the original springs. If you want more spring have all new springs made.
But that's just my 0.02, based on seeing how hard spring modifications are on OE springs in several of my vehicles over the years.