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You could do a complete airbag conversion. AirFlex and AirBagIt both make kits. Kinda pricey though.
Firestone used to make a kit called R4tech that removed all but your minimum load leaf spring with a supplemental airbag to handle heavier loads. The kit had a built in bleed for "kneeling" the rear end of your truck. That might be doable on a home built system. Remove a few leafs until your truck drops then install airbags between the axel and frame to lift it up. You may have to put traction bars on though, spring wrap might get bad.
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