I'm leaning towards that as likely. However, I still can't figure out the odd arrangement. Your example is a common RV window, with a fixed panel on top and vented ones down low, but it's still all 1 piece:
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Our UFO attracting "van" seems to have an upper window and then 1 or 2 separate lower windows that, unusually, don't line up. It has an almost random layout. I can't figure out the offset. The amount of material between the glass also suggest separate windows. I've been to enough RV shows to know the emphasis on "light & bright" and the maximizing of glass in any particular assembly. Even smaller windows will have minimum framing. There does seem to be some sort of handle at the intersection of the 3 panes:
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Again, it's always possible this is some sort of 1 off custom or even a DIY van conversion. Some dude got a van and some windows and just cut holes wherever he felt like it.
That seems unlikely given the window layout. The Dodge Caravan, and it's Chrysler/FCA/Stelantis siblings, is the most ubiquitous minivan and has scarcely changed its basic layout in nearly 30 years, 1997 vs 2024:
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Same for Toyota and Honda minivans.
Definitely a mystery vehicle at this point. And IF the strange frozen frames that appear in the flip around sequence do indicate some editing between the 2 scenes, it could even allow for 2 different vehicles. If these guys are traveling this stretch of road routinely, they could have made multiple recordings and attempts.