Has anyone had experience with a TurboCool evaporative (swamp) cooler? It looks like one could replace the fan with one of these (and still be able to lift the roof per http://www.wanderthewest.com/forum/showthread.php?t=1323).
I looked into those a little bit and then decided that I liked having the lower profile of just the vent on top of the roof for better clearance while 4wheeling.
I used it for the first time this week. The dog loved it as we were able to leave her in the truck with it for awhile while were were in the dog unfriendly areas of the various parks in Southern Utah. We also used it ourselves for awhile when we were camping near Monument Valley. I was using it on low w/ ambient temps around 85-90 and was quite comfortable. I have yet to try it any warmer weather.
I know a few other people on the board have the Swampy as well and can perhaps chime in with their thoughts.