Air down with the smallest wheels, biggest tires, possible. Consider wheels too narrow for recommend street use, of off road tires as well.
Disco the sway bars.
Get the firmest stiffest shocks available. ''But waa, makes ride stiffer.'' Then you can reduce spring rate. Coils are cheap up front, Deavers in the rear.....not so much.
You have to soak up bumps, and have very limited travel to do so. Cheap way, is stiff progressive springs and worthless shocks. Expensive way, is $1000+ a piece shocks and correct softer springs. Obviously stiff rear springs for towing/hauling mess that up. You'll need extremely firm reboumd in the rear to compensate for it.
Comp adjusters are near useless. Bypass shocks don't work effectively on pickups due to such low amounts of travel and the heavy weight chassis. Get the biggest Kings that you can afford, and the tools to valve them yourself. Accutune, and Filthy Motorsports can get you really close though.
Consider mild lifts that increase suspension travel a hair.
Consider softer bump stops.