MitchellonDemand shows 938 TSBs for the 2002 trailblazer which I think is the first year.
Keep in mind alot of them say the same thing and some are just general notices for all cars, like "dont use 3M pads to remove gaskets on aluminum manifolds.
I think the camaro has like 33.
2016 Miata: Made more passes than the others combined
1994 Fireturd A4: Racecar
1997 Corvette M6: Bolt ons SOLD
1997 Z28 M6: Cammed street car SOLD