It looks like you may be ok, as long as mentioned, just watch what you do load in the bed.
We were in the same position, up to about 200lbs over the gvwr of our '10 Chevy 1500. But we had a fair amount of stuff loaded in the tt that my better half wanted in the truck bed. So as you can see by my signature, we now have a 2500HD, and then got a new trailer! Lol
I had considered removing the Century cab high topper, but that would have only got us down to the gvwr.
Adding airbags will not increase the axle rating in any way.