If you are going to do both air ride and stretch the frame, it is probably easiest to go to the boneyard and get the whole rear frame section and axle from a truck that already has air ride. Just cut it behind the cab and weld it to your frame wherever it needs to be to get the wheelbase you want. No mucking around with the suspension, brackets, air bags or anything. And you would need to stretch your frame to move the axle back anyway, so you are getting the air ride for no extra work. Then sell your old axle to recoup some of the money.
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