I'm homing in on 250k miles on my 2007 Tahoe. It has the max trailer pkg with 2 speed xfer. Like Mello said, it has the additional cooling, which I think has been helpful in the longevity of my Tahoe: original transmission and engine. I've towed a 23' sea ray multiple times cross country in...
I had magnetic shocks on a 2016 Chevy SS. The performance was good, but both front shocks needed replacement, one was under warranty (<36k mi) and the other out of warranty (39k mi). Well over $1000 for one shock. Maybe the new ones last longer; I don't know.
My mechanic replaced one hub with an aftermarket (I told him to use OEM...) and it only lasted 40K miles, and then I replaced both with OEM, using another mechanic.
2007 Tahoe, 240K miles
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