I think the Stable Loads and air bags will work well together. The Stable Loads will support some to all of the weight, depending on the psi of your bags. I also think the Stable Loads will carry the weight of your TC if the bags were to fail. The truck might squat a bit more, but not enough to be an issue.
I have Stable Loads on my 2004 DRW with a 4,000 lb TC. All they do is shorten the travel distance the upper overload before the overload makes contact. With the Stable Loads the rear of the truck squats about 3-inches.
I recently bought airbags that I have yet to install. I expect they will raise the rear back to its normal height. I will have to experiment as to just how much load the airbags will carry.
Wayne