[Slufoot733]

Some thing to consider. You are about at the limit, or a hair over, with the rig you describe. The air bags will lift the rear of the truck, they will level it, if that's what you are looking for. However, they do NOT increase the payload of the vehicle. You have not upgraded the springs, axles or brakes. Many drivers have done this and have never had a problem.
BUT, the single thing I would worry about is being legally over weight. Yes, you might get away with it, you may never get pulled into a weight station. But, God forbid, you are ever in a crash and the weight of the rig is compared to the registered weight, and you exceed that stated weight, you will possibly be in court for a long time. People love to sue other people. In this day of 'blaming someone else', an over weight vehicle is prime pick'ns. An over weight fine is one thing but a settlement in civil court can wipe you out. That, plus lawyer fees can be the end of everything. Even if you are 100% not at fault, if the issue of the vehicle weight ever arises, and your rig is over the limit, even by a little bit, the sharks will be all over it.
Just food for thought.