I had air shocks installed on my old ford ranger truck...
I loved them to death...When I loaded up the back end, I pumped them up with plenty of clearance...I let the air out of them when the back end wasn't loaded down...
Air shocks are only used as rear shock replacements...But if I were you, instead of getting air shocks, just get SLR Shackles or rear leaf spring inserts...
Either one will give you at least a 2" rear lift...
Good Luck
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Andy
PNWX-Member