In truth 1/2" rise will take a couple hundred pounds off the steering axle. that will make the steering axle light, and easy to turn. that will cause sway. Air bags, or any thing else you use to stiffen the rear will NOT return the steering control to the steering axle.
Only a WDH will return steering control. And Yes, It WILL correct the rear sag. By the time you get the front back down where it is supposed to be. The rear will come up close to where it started from. AND the entire thing will drive way better.
The WDH IMOP is the way to go for safety, and control
Terry & Shay
Coachman Apex 288BH.
2013 F150 XLT Off Road
5.0, 3.73
Lazy Campers