I've had either steel overloads, elastic overloads, or air bags one at least 11 of our trucks used for personal or my businesses use and hands down, air bags are vastly superior as they are fully adjustable to the load or unloaded and ride like floating on air because that's what it is! The others have ZERO adjustment to varying loads when installed. A light load in the bed with people riding in the rear seat is like being on an unsprung buckboard and it was a constant complaint.
With air bags, using the onboard compressor with controls for each side is as good as it can get. Had 3 trucks setup this way with Air-Lift System bags and it gives infinite control anywhere anytime. Load first and then set inflation as needed whether with the onboard compressor or use the exterior fills. 100 psi gauges, if gauges are installed, are a min as driving over bumps in the road alters the bag's psi constantly as the axle bounces. The bags themselves are capable of 250 psi pressures (my Air-Lift bags are) for short terms without any damage but do not inflate them to over 100 psi idle when loaded. Inflating to over 100 psi will create pressures of even over 200 psi on large bumps and can or will bend the bag's mounting plates or brackets and ruin the bags.