You guys are thinking way too deep here---getting carried away, with the
thought of hanging, cutting, and venting---

How about this simple solution?

I have seen advertused in the summer month's, ( I think at Best Buy ) a
portable room Ac unit on wheels, that isn't too big, and is
movable---This unit could be moved anywhere you wanted in the van, tent
, whatever, and wouldn't take an act of God to make it functional----

I'm buying one anyway, it's the cool, simple solution for me----

Later,

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Terry--

       "Zoom, Zoom, Zoom"
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http://community.webtv.net/CTONLINE/TerrysHighOnLife