I remember it from when 68 came to Palmetto back in 2006. It spent a lot of time in the corner there too.
We've got first-hand evidence that
truck carts can work these days; theirs is pushed from behind and has a much narrower track width. Short of going for the 2014 Sierra shell instead, I think you've hit most of the use cases.
Unless, of course, you find a way to put
Super Cruise on it.
(How do I nerd out like this? I work at a GMC dealer.)