Since no one mentioned it, two things:
1) Airbags are used to smooth out chucking in 5th wheels, bounce on bumpy roads, and bed leveling under rated load (older trucks with marginal springs).
2) They DO NOT increase your load carrying rating (Payload).
The GVWR of your truck will not increase with airbags or helper springs.
If you are pulling overloaded, airbags will not increase your "safety".
Lou and Laura with Bella - German Short Hair Pointer
2008 GMC Sierra 2500HD Crewcab SB Allison Duramax
2010 Flagstaff 8526RLWS - Superglide 3300
HAM CALLSIGN - KC3FFW