I have seen a pretty sweet setup I thought about for a while. The guy had completely cut off his top over the cab to keep the cab open for circulation, and he had already ripped out his a/c, heater, fan and everything. And he got a setup sort of like that crock pot, but instead he ran a pvc tube straight to the hole where the blower motor goes for the a/c system, and between then little lip and the pvc, he put one of those heavy wax rings you put around the base of a toilet bowl(new ofcourse) And from the inside of the cab just plummed it to the a/c ducts he wanted the air to come from and put some light filters by the firewall and some heavier filters a few inches inside the a/c ducts. And he told me a while back that the wax ring has kept it bone dry for a few years now. It was a pretty slick setup. Good luck with what you decide
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Remington