Hey all! Got my truck back on Friday evening, and I’m very happy to report that most (if not all) issues I brought up were handled and resolved! Wanted to outline everything that was done here (based on my original post) for the future "me" that encounters these issues, and how they were handled by the dealership.
1. Power Onboard Fan issue: There was indeed an issue with the DCACA module in my truck, which would basically turn on the inverter fan every time the truck would start, and have it at full blast (it sounded as if the rear seats had cooled seats enabled). Here's what they did:
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I can confirm that after performing this fix, I no longer have to manually turn off the generator every time I get in truck; it’s as quiet as it can be!
2. Rear window/passenger door rattle: I brought up the TSB 22-2095 to the service advisor, and she wrote it down. The tech did install the rear window service kit from that TSB (although they mentioned TSB 22-2349A), and the rattling is gone!
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As for the passenger door rattle, it looks like it was the speaker itself:
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3. Clunking/Thumping Noise from suspension: The biggest one, and the one I thought I would get pushback on. To my surprise, they did use the chassis ears and found the issue coming from the rear shocks, and both were replaced!
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The truck now rides SO much better, and there's no more clunking noises coming from the rear (not even if I hop on the bed like some have done). I will attach pictures of the new shocks for context in another post (for those that need the part numbers).
All in all, I’m extremely happy to have these issues fixed; they were really taking a toll on me properly enjoying my truck, and now it feels like a completely different truck.
I want to thank everyone on this thread who provided help/feedback on these things, and I hope all of this is helpful to someone else in the future that might have gotten a "bad apple" 21' model.