GMC Hummer H3 2008 Owner's Handbook Manual page 167

Seats and Restraints
CAUTION
An unsecured child restraint
may be tossed about the vehi-
cle in a collision or sudden stop.
You or your passengers could
be injured. Secure the child
restraint properly even if a child
is not using the restraint.
CAUTION
Child restraint anchorages are
designed to withstand only
those loads imposed by correct-
ly fitted child restraints. Under
no circumstances are they to be
used for adult safety belts,
harnesses or for attaching other
items or equipment to the
vehicle.
. . . 166
For most types of child restraints,
there are several different models
available.
When choosing a child restraint,
take into consideration not only
the child's weight, size and age,
but also whether the restraint will
be compatible with your vehicle.