The installation paper for mine stated the bags supports 50 pounds per pound of pressure. So I keep mine at 12 pounds to take 600 pounds of the spring and still have some springs and shocks actions.
I have a different truck now and don't run bags, but when I had my F250 CC V10 4x4 and my Saber 34TBOK with approx 2500lb pin weight, I ran about 55psi loaded. Had them as high as 60 and as low as 30 while towing. Empty I'd shoot for 10-12psi.
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Joel and Teresa
2016 Sabre 34TBOK
2006 GMC 3500 CC LB DRW 4X4
I have the 2007.5 Dodge 2500 with Air Lift bags pulling a Wildcat 327re with about 1600 pound tongue weight unloaded. I have played around with the pressure a little and I have found that about 28 to 30 pounds gives me the best ride on rough roads. I leave it around 10 unloaded.
2007 Duramax 2500HD pulling 2012 Wildcat Sterling 32RL with Sidewinder pin box and Fifth Airborn Air Ride. No air bags. New Bilstein 4600 shocks eliminated bouncing. Truck runs level or a little above.
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Scott and Liz - Southern NM
2012 Wildcat Sterling 32RL - w/level up (best option ever)
2007 Chevy 2500HD Duramax
Reese Fifth Airborne Sidewinder