I have a 2018 Silverado, crew cab, short box, 4x4 with the 5.3. Here are my numbers from the last time I weighed it: Front axle - 3480, Rear axle - 3040 = 6520. I had a full tank of fuel and an additional 165 pounds of camping gear in the bed.
I tow a camper that weighs 7920 fully loaded, and I use the same hitch as you. I disagree that air bags are a band aid, as I do use them. I set up my weight distributing hitch with 5 psi in the bags to get the front axle weight close to the unloaded weight, I then add 15 psi to the bags. I do not lift the rear of the truck with the air bags, I just supplement the rear leaf springs to help the truck not bunce as much as it did without the air bags when towing.