I probably used some wrong terminology, as you can probably tell I am a little clueless when it comes to leasing. 
The new 2021 Tahoe is a huge improvement over your model but is going to cost you since it’s so new.
I’d get some quotes from vroom/carvana first and see where you actually stand. I see the the value in both arguments but once the equity check gets large enough it’s hard justify not getting a new car.
Unfortunately too big for my garage! It looks stunning though!