You would be better off trading your truck.
From my experience with Mercedes and BMW, replacement airbags/shocks can cost upwards of $1000 per corner. Plus the cost of any modules, etc. Then you would have to pay for the install. First you would need to find someone competent to do it. (I doubt any dealer would touch it). Then finally you would likely still have to go to the dealer for programming your computer. Shoot we have to go to the dealer to activate cargo lights when they are installed aftermarket.
Vs. getting the option already installed - I believe the price or the air suspension is around $2000 or less installed from the factory. You could easily spend $4000-6000 or more trying to retrofit.
This ranks up there with installing a hemi into a v6 equipped truck or maybe slightly easier than installing a panoramic roof after market.