I use the hang in window air conditioner on my van when camping during the summer myself, but have always been thinking of other solutions.

I was wondering if anybody has considered the following method.
Install an AC motor in the engine bay with a belt going to the compressor.  Put a double clutch on the vehicle air conditioner compressor to handle the belt from the AC motor and the engine.  Use a transformer/invertor to change the 120 VAC to 12 VDC to run the interior air conditioner duct fan and the fan up front behind the radiator.  This would be ideal, because there would be no modifications to the vanagon body itself and no appreciable space would be used.

I haven't researched how much horsepower the air conditioner compressor uses or if a double clutch unit is available.  My thinking is that these would be the two hang ups for following through on this idea.

Thoughts?
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86' Syncro GL (for sale)
84' Subaruvanagon Westy
01' KLR650