Congrats on getting your new Telluride @Drewmama! You could try changing the bulbs to brighter ones to help brighten the interior.I would like to know this, too. Just got our 2021 S a few weeks ago and was very surprised that the rear cargo light doesn't come on when any of the passenger doors are open. I mean, that should be standard. If you have people sitting in the 3rd row, lighting would help with seat belts.