Where did you get that valve, Pog? I had a hell of a time finding one for my pump.. dug one up on fleabay eventually. And you might want to either put another one inside where you can reach it or figure out a push-pull system for the existing - just in case the electrics fail when you're in the car!
VPOGV, what you've done is exactly what I was planning. I gotta say, I`m leaning toward the window tunnel plan though. How exactly does the valve work? I did not even think of it, afterall...electrical NEVER fails.. right? *sounds great*
I put mine up front but laid it flat with some spacers. Works for me.