Got a loud whistle coming from rear cab window

Hi all, just got the camper and when I’m at highway speeds I have a really loud whistling coming from the truck cab rear window. Has anyone else had this problem?

I have the tundra crew cab with the rear window that rolls down.

If I barely crack the window it goes away.

Just picked up my camper last weekend and I have the same issue. I just leave the back window slightly cracked and it doesn’t bother me. It should still be water tight too.

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Same with my crewmax.