[L R H]

AFAIK, there are no air shock, and no inexpensive booster type spring over shocks for hardly any of the mid/smaller sized trucks due to the shock tubes being so close to either the leaf spring pack, the brake backing plate, or the U-bolts/U-bolt lower plate, or any combination of the above. The lower end of the shocks on most older US full size pickups are inside the spring pack; some just inches from the diff pumpkin, where they are just as effective on two rear wheels hitting a bump, but less effective on one wheel bumps and have less effect when needed to slow roll angles on evasive maneuvers such as swerving around an obstacle.
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When Ford re-designed the F-150's a few years ago, the used a considerable amount of ink printing in ads how moving the shocks outboard of the leaf springs was something NEW and wonderful, whereas many others have been doing it for years.