If you haven't already, consider the MaxxFan (from same folks). It's also rainproof but unlike the quick and dirty (literally aero wise) cover it folds flatter for travel. They are also built much sturdier than regular roof vents. Instead of one flimsy crank on one side only so the lid is prone to rattling in the breeze (even parked) the MaxxFan mechanism is two sided plus it locks it any position so you can (if you want) leave it up (however little or much you want) going down the road without damage. I put one in my trailer and love, love, love it. Not cheap (a bit more than Fantastic Fan for powered vent) but worth it to me. YMMV
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