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I had the same problem until I covered the cheap dome covers (made by Heng's--super cheezy) with the heavier white one that you included in a picture.  The ones I used are made by camco and I covered all 3 of my roof vents with them.  I cant believe your flange ripped off!  You must've encountered some serious wind!!  I rarely exceed 70mph when pulling my VRV.  I trailered it all the way from Michigan to Florida and back and thank god all my covers are still in place.