Hummer 2006 H2 Owner's Manual page 53

Second Row Seats — SUT
For SUV models with third row seating, the top tether
anchor is located at the bottom rear of the seat cushion
for the seating position in the third row.
Third Row Seat — SUV
Do not secure a child restraint in the right front
passenger's position, or in the second row outboard
positions of a SUT model, if a national or local law
requires that the top tether be attached, or if the
instructions that come with the child restraint say that
the top tether must be attached. There is no place
to attach the top tether in this position.
Accident statistics show that children are safer if they
are restrained in the rear rather than the front seat. See
Where to Put the Restraint on page 1-42 for additional
information.
1-47