These coolers actually work great on a long drive through the desert..... so much so,they even had a a network of "Desert Service" gas stations that rented them out for the long hot drive through the California desert on Route 66 in the late 40's & early 50's.

http://aftonstationblog-laurel.blogspot.jp/2011/02/neat-device.html

I know a guy that owns one of the original "Desert Service" trucks & it is still his daily driver.

http://pic20.picturetrail.com/VOL1568/13678754/24528751/413549052.jpg










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Things are a blast.