TrailBlazer

Anchor brackets for the rear seat positions are located on the floor in the cargo area of your vehicle (TrailBlazer only). Do not use the rear tie-down brackets near the liftgate for top strap tethers.

Do not secure a child restraint with a top strap in the right front passenger's position if a national or local law requires that the top strap be anchored, or if the instructions that come with the child restraint say that the top strap must be anchored. There is no place to anchor the top strap in this position.

TrailBlazer EXT

An anchor bracket for a top strap is located at the bottom rear of the seat cushion for each seating position in the second row (TrailBlazer EXT only).

Do not secure a child restraint with a top strap in the right front passenger's position or in the third row seating positions if a national or local law requires that the top strap be anchored, or if the instructions that come with the child restraint say that the top strap must be anchored. There is no place to anchor the top strap in these position.