No experience with this unit but can tell you evaporative coolers like this will be no good
in a confined space as they need to exchange air, ie bring in dry air from outside and
pump humid air outside.
In a confined space like a a van it won't work if thats what your thinking, be alright outside for a cool breeze.
Remember staying in a cabin once that had an evaporative unit in a wall, it worked great
but have never seen a similar unit since.
Cheers
LeighW