We too have a Fan-Tastic Fan on our unit. I installed a Maxxair Fan Mate cover for it that allows it to work on the road. The only problem is when the Fan-Tastic Fan opens up the cover will not allow it to open all the way. I called Maxxair and asked about it and was told that the fan opener has a sensor that adjusts for this.
Fantastic-Fan now offers an Ultrabreeze cover that looks like it allows for the fan cover to fully open. I would probably go with that versus the Maxxair Fan Mate cover.
2013 Denali 330RLS, Fifth Airborne King Pin Box, Equa Flex, JT Strongarms
2011 Ford 250 6.7L dsl