But the good news is that I starting searching for a replacement one. Started out looking for a similar situation, gently used 2016 with low miles. Same guy at the dealer we got her Enclave from asked if I had considered new. Long story short, with the GM rebates and a "good customer" discount

this 2017 was only $1200 over my price a the 2016.
So we made it work.
It is a 2017 LTZ in "Pepperdust" which is a new color for 2017. "Cocoa Dune" Leather Interior. Sunroof, cooled seats, all that fancy stuff. Only have put about 25 miles on it so far, but it seems like a fine truck so far.
I'm not in love with the garish wheels, and may change the bowties out. But all in all I'm quite pleased with it.