One problem related to steering column has been reported for the 2005 Chevrolet Trailblazer. The most recently reported issues are listed below.
My son was backing out of his girlfriend's driveway and he turned the wheel sharp and the shaft inside the steering column broke. Luckily he was not on the highway when it happened. I haven't made any repairs yet but will today or tomorrow. The steering column and clock spring will have to be replaced. I am going to save the steering column in case you need to inspect it.