(Add my two cents); I sat in a Lariat on Saturday (6'5" 36 inseam) and fit however I did knock my head getting into the driver's seat. Once in, had good head room and ok leg room. My daughter sat behind me (5' tall) and had maybe 2" of knee room within the cut-out of the seat back. That...
"And finally, good rear seat room, a bit better than the Colorado but not by much."
This was my thinking (having not been in one but based on reviews/data to date). Hoping that's enough for my kids comfort.
2017 Chevy/GMC mid-size rear seat legroom reported as 35.8" on a crew cab (per https://www.caranddriver.com/reviews/2018-chevrolet-colorado-in-depth-model-review-2018-chevrolet-colorado-interior-review-car-and-driver-page-5). Not sure if that'll cut it for me as I tried on one of those at an...