Years ago I overloaded my pickup with a camper. We added an extra leaf to the rear springs to level it. A year or two later a rear axle bearing went, luckily at low speeds, and that rear axle slid out from the housing.
I agree with about everyone else here. You have not increased your payload capacity, or the truck's GVWR or GAWR's, by upgrading the suspension alone. Some of your other upgrades will certainly help, but there are many items that need to be considered, including a heavier duty rear axle with heavier bearings.
If you are only occasionally carrying over-weight loads for short distances, then there may be no problem with the airbags. Who knows how over-engineered the truck is?
But for longer trips with your trailer, a WDH is a much better leveling solution, as it actually removes weight from the rear axle, the weakest point. And the air bags may still be useful to stiffen the truck's suspension while towing with the WDH.
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