I had air bags on 2 of my Fords and carrying variable loads loved them.
Would put 30psi in them even as empty as this seem to improve ride quality.
Last dually is used for camper only and coming from C&C has suspension that handle my >4000 lb camper well, so I did not install bags.
But the few times I drove it empty was making my dental expenses increasing.
I actually have Firestone bag left over that I could send you, but I am in the process of moving, so it is somewhere in the storage 560 miles away. Not likely I can find it soon, but PM me your shipping info.