Why air bags? To level a load that is too heavy on the hitch? Because the tow vehicle is towing too heavy for its rating? To make the road surfaces easier on the back side? Help us understand, ple...
I see all these post where posters claim to be well within their numbers, but still need bags to level. I am over my GVWR, well within axle rating, and have no need to bags, don't even engage the overloads.
It may also be a function of manufactures trying to put a softer ride in the HD trucks, therefore playing with the spring rates.