Don't give away the secret. GM has never advertised the Trailblazer as a police or special service vehicle, but trust me on this ... there are some suspension, hidden lighting and bumper reinforcement tweaks on more than one or two in this country. They might be popular in certain areas - cough stolenautounit cough - where they are fast, nimble, tough and (most important in these units) ubiquitous.
I always wanted GM to consider them for a slightly smaller version of the Tahoe pursuit because the basics are already there. It has a very low center of gravity and room for the 5.7 litre V8. Unfortunately, it was the timing that just made this not happen. By the time GM was ready to build and test the 4WD Tahoe as a fully-pursuit-rated police vehicle, the Trailblazer was out of production.
I can only take comfort in the fact that LAPD SWAT used Trailblazers ... or, at least in the movie "SWAT." If it's good enough for Sam 'mofo' Jackson, it is good enough for me.