I suspect the warranty is in place due to the fact that some applications require drilling the overload spring to retain the wedges.
Think about taller CG like a lever. When you apply the same amount of weight higher, it applies more stress to the suspension than hitch or pin weight. People keep comparing big rig air suspension to the supplemental bags - The geometry of the suspension travel is different and the cross section verses travel is also different, so I do not feel you can do this. The spring suspension needs to be tensioned and the bags used only to limit bottoming/sag when in motion.