Similar to the Explorer, there were a bunch of Tahoes sold so there should not be a shortage of parts or people that know how to work on them and have probably already figured out how to remedy many of the common issues. I've personally not had good luck with GM products though so I'm probably not the right person to ask since I'm a bit biased toward Ford and even Chrysler (over GM). There are many folks biased toward GM though, so clearly many people have had good luck with GMs (or just don't know any better.
)
-Rod