Though I haven't experienced that with the Gemini, (yet) with our previous DP there were times that the wind hit those toppers just right, and they would flap and flutter all night, and even though they were side slides, would keep us up at night. I think its more or less the nature of the beast, and if you can re-park with a different orientation to the wind it may help, but that's not always possible.
__________________
|