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I think it was always the same truck at NAIAS? NAIAS might have been pre-production instead of prototype like they had at Chicago in Feb.
Nevermind, I see what you're saying from some videos. Press event at NAIAS had the same one they had in chicago. Guessing it's more finished or something.

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Maybe this RST has the MAX tow package... so it requires more air?
The 20k towing package? I imagine they definitely need more cooling to pass the SAE tests at that level of weight. I sort of expected gen2 of the ultium chemistry for the extra capacity, but I suppose it's not strictly necessary.
 

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Any Hummer owner who might feel like popping the frunk tub from their EV and taking a look at how the cooling air actually flows through their glycol and refrigerant coils could probably help resolve this question.
Feel free to look at my improperly filmed short video and see if you can determine that yourself.

If not, can't say I didn't try.

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