I camp inside of my regular ol' ARE camper shell for my Tacoma...now that summer is coming around the corner I'm looking into cooling solutions. Don't carry a generator so AC is out of the question. Have no plans to cut into the roof so roof fan is out. I was thinking the front pass through window would be a great place for a window fan...basically would need a window fan with some sort of flexible housing to keep it snug in there -- does something like this exist or has any1 retrofitted their own? 12v and low draw obviously ideal...