Does a truck need anti sway bars carry a camper?

I'm not sure why you think an anti sway bar is so vital. I carried an 8' pop-up camper on a '96 Dodge 1500, an 11' 4,000 pound Fleetwood camper on an '07 Chevy 3500, and the same camper on an '05 Chevy dually. None of these trucks had anti sway bars. I don't remember any truck I've ever owned in the last 25 years having one. I never felt that one was needed, never crossed my mind. I did have air bags on all 3 trucks.