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This  seems like an excellent solution to me. I think it would work great.
All that is needed would be the proper compressor size to mount under the
van.  The only problem I see is finding the right compressor. A large window
unit compressor  looks  good at first but I think most window units use r22.
I will check with a retired  a/c  service man who is a good friend of mine,
maybe the  compressors will pump either refrigerant .  He  knows all the
ins and outs  facts and  figures and has many books.  If it is as hot in
Memphis as Southern  Illinois I understand why you are concerned with a/c.
It hasn't been very hot and humid here.

Darrell Boehler
Makanda Illinois

>
>I think you'd be far better off if you simply added a window unit
>compressor in parallel with the stock compressor. You could locate it
>almost anywhere under the van. The valving in the compressors would keep
>the refrigerant from flowing backwards. You'd have to make up some custom
>hoses (with proper fittings, or it'll leak) but it wouldn't be too hard.
>Add a battery charger with some smarts to keep up with the current demand
>for the fans and such, and you'd be in great shape.