They're essential equipment... especially on a dodge.. I'd recommend getting the air compressor to go with it (though you may want to shop around to get a deal on those)
Our old Chevy 1 ton doesn't need the airbags.. it has 16 leafs on each side in the back.. If there was ever a truck that rode harsh, that would be it.. My '94 dodge on the other hand only has 5.. without air bags it sags when you stand on it, some pressure in the bags and it fixes it nicely.. also really good to re-aim your headlights on the fly.
My truck is the '94 flatdeck, 220,000 miles, LOTS of work done to it (by me, on the cheap), pushing close to 500rwhp.. Yes, I replaced the seat.. last guy who owned it must have been a 300 lb guy who totally collapsed the side bolsters getting in and out of it.
I built and designed the bumper and deck.
Dad's is the '92, 300,000 miles, only body work done to it, auto tranny replaced once.. beautiful shape inside and out, but BORING to drive