The Trailblazer has new BFG long trails on it, new shocks, etc. You addressed my fundamental concerns about tipping, which is becoming more apparent with age, regardless of tires, shocks, etc. I may be an experienced driver (and even then), but my kids are not, and may not anticipate instability on off ramps or sharp corners. Going out to look at the cars you suggested as well as the Kia Sorrento (much better model this year) and the Mitsu Endeavor.
I guess my doubts about letting the TB go is the fact that it is such a classic, with a truck chasis, great authority on the road and heft. Didn't want to sacfifice a gem, if indeed that's what it is. Just facing a lot of repairs, and wasn't sure if I should sink more money into it.
Thanks to all of you for your very detailed and helpful replies!