I didn’t say it would physically add tongue weigh capacity to the truck :laughing:. I said it would reduce or solve the stress of driving with too much weight on rear axle.
Although I would point out in PA, a mechanic will sign off on an MV-41 to increase GVWR by a reasonable amount if suspension enhancements, like air bags, are added. Ive done this twice with my mechanic. My current F-350 STW was updated via an MV-41 to a GCWR of 25,500. I added firestone Ride Rites
Excessive Squatting affects handling and visibility. Air bags also add some cushioning to the rear axle and takes some stress off the rear axle components and reduces squatting.
A 14k bumper pull, depending on the year and configuration of a 3/4 ton, should be within the limits of the truck, but its at the upper limits. Air bags will level the truck, improve ride characteristics, handling, visibility and safety. Look at how common they are. Theres a good reason for that.
If the OP wants a GN, then go for it. I was offering an alternative point of view if he is tight on money and really doesnt want to spend thousands. Air bags make the load safer to drive down the road. Theres also the aspect of cops. They see a truck going down the road nose-high, they suspect overloading. That opens the OP up to a lot of other problems.