GMC Chevrolet Tahoe 2003 Manual page 66

Tahoe/Yukon models: A child restraint with a top strap
should only be used in the second or third row. Don't
use a child restraint with a top strap in the right
front passenger's position, because there's no place to
anchor the top strap.
An anchor loop bracket for a top strap is located at the
bottom rear of the seat cushion for the center seating
position in the third row.
Third Row Bench Seat
1-60