Air bags were not optional, they were OEM. Airlift bags are orange, Firestone are blue: that's the only difference I ever noticed. In 10 years I replaced bags twice.
Running without air bags changes the wheel camber. Years ago when I had a P30 I had bags fail in central Idaho and drove home to Vancouver BC. My new front tires scuffed so bad on the inside that I had to replace them: outside of tire looked new, inside of tire was bald.
I replaced air bags and tires and ran over 50,000 miles on the new tires before I sold the unit, with no more tire issues. My front axle was rated at 4880 pounds, I ran 50 psi in the bags.