Wow. Just buy a weight distributing hitch and do It right. No major install. And it actually distributes the weight to te front wheels rather than just "leveling" the tow Rig. And when you're not towing its factory everything.
I used a Reese setup. Way overkill for your application but it makes way more sense than dealing with airbags. And not to mention takes a lot of stress off the rear axle.
93 yj. 355 chevy, heads, cam, intake, etc. 35's, bumpers, winch, lights, and a killer stereo.