Re:roof vents
We always keep our vent covers closed when we are driving (are you referring to the transparent/translucent crank-up & down covers?).
When we had our cabover camper we once left the vent cover open, and it blew off on the freeway. We found it a ways back on the road, smashed pretty flat. It was pretty heavy aluminum, much more sturdy than those plastic ones on the TM.
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