Even I don't need air bags on my present dually, I had them on 3 previous trucks.
My favorite set was to run the air tubings inside the cabin and have Firestone dual valve/gauge mounted on floor next to driver seat, so I could see it when I enter the truck.
For inflation you don't need much air, so even $10 12V compressor will work for some time. Those wear out fast and I finally ended with Firestone portable compressor that I was plugging into cigarette lighter and had schrader valve on dual valves.
The only thing to remember was not to start the compressor under pressure, or the fuse would blow. 140 psi is no joke.