Sway bars first, second for the weight, assuming it is only some of the time, I would suggest spring rubbers. Easier, cheaper and removable/installable in minutes.
Jack the rear of the car up, throw in the rubbers and instant added spring rate without lowering. You can go all NASCAR and drill them and put nylon cord through them for easy removal. If going serious offroading, throw some zip ties around them and the spring to keep them from popping out if you hang a corner in the air.
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