I've used airbags a couple of times on work vehicles, they can be a pain in the arse if for some reason one side ends up at a different pressure to the other. They do seem to improve the ride but to my thinking it's just another thing to have to do. If you are towing all the time but then for some reason not towing and deflate the bags for ride comfort and get a surprise tow job come up you have to pump up the bags. That means carting a damn compressor or pump with ya, just more crap!
My thoughts are just sort the suspension out right first time, get it set up for the loads you normally work with and the vehicle will go better for it. The chassis for one will be happier without smashing the bump stops all the time, and for some vehicles even things like airbags can stress the chassis where it's not reinforced for it.
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