Payload, axle ratings, and gvwr/gcvwr are certified ratings. Nothing but recertifying changes those. Adding airbags will only lift the rear of the TV up off the axle, reducing squatting. As far as weight transfer, the airbags themselves weigh far more then the few lbs you might be shifting off the rear axle.
The biggest advantage to airbags, other then eliminating squat, is to get you up and off the overload springs. Either totally engaged, or not at all, life is good. Bouncing off them as you drive down the road makes for a VERY rough ride.