I think this guy has it figured out...(at least for my purposes, it was inspirational) Can you say "Copy"?
His board name is WA.http://www.tnttt.com/viewtopic.php?f=42&t=40504&p=741734#p741734
I'm going a step further, building a free standing insulated "closet" which attaches to my now infamous vertical e-track, making the A/C "closet" removable. I'm putting mine in the left rear door, allowing the right rear door to latch back sealing the A/C closet to the outside, and leaving the left rear door open to vent. (excepting rainy conditions of course) This gives us load/unload capability with the one door while the A/C is in and of course no A/C when the weather is nice.
Not the best picture, but the first row of E-track is about 20" from the rear. Just right for a window A/C to be mounted to a 2x4 frame which inserts into the E-track beam socket ends. The width of the closet will span the left door width, height=floor to door opening with a boxed in roof, depth of course from the rear door to the first e-track strip. I'll post a picture when it's done. (I just realized my description is probably useless).