To know for sure, you should:
* Check your Trailblazer's owner's manual: This will provide the most accurate information about car seat installation.
* Consult a car seat technician: They can assess your specific car seats and your vehicle to determine if a safe and legal installation is possible.
* Try it yourself: If you have access to the car seats, attempt to install them. Pay close attention to whether the seats fit properly and securely, and whether the seat belts are routed correctly. A tight fit is not a safe fit.
Don't rely solely on online forums or anecdotal evidence. The safety of your children is paramount.