One problem related to bumper has been reported for the 2003 Chevrolet Trailblazer. The most recently reported issues are listed below.
The rear bumper of my 2003 chevy Trailblazer cracked duing an impact of less than 5mph. Gm told me that this isn't a problem, and this might happen. I thought they named this a bumper because it was there to withstand some kind of impact.