rear end sag

I have a srw 2011 6.7 diesel towing a fiver thats 14k loaded.Truck sits "level" when loaded.I STILL. put air bags in with on board compressor because the fact of the matter is the truck rides better.I can dial in what ever psi I want.I dont have the bags because im overloaded,unlevel etc.Im well withing all my ratings.The bags stop unneeded bounce for myself.Ive had timbrens and stableloads in the past and neither compare to the bags.Point is to some posters who said if you need bags you are prolly overloaded.Not the case.Bags in some instances just make the overall ride,comfort better.Why do most /some box trucks big rigs,fire trucks etc have bags stock from builder? COMFORT AND LEVELING.Not because they cant haul the load.

A side benefit of bags is it brings your headlights back down to where they are set stock.Anyone whos tows at night and has some sag knows what im talking about.Alot of duallys have bags for this sole purpose.