Another option is a portable dehumidifer. That way, standard evaporative cooling methods will work though I can't say for certain how effective/quickly the dehumidifiers are at sucking out the moisture. But if you've got a plan for dumping the A/C heat out the back why not.
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My 5 pillars of fuel efficiency:- driving style
- aerodynamics
- tires
- weight reduction
- engine maintenance
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