GMC 2011 Terrain Owner's Manual page 117

Loading cargo on the
roof rack that weighs more than
100 kg (220 lbs) or hangs over the
rear or sides of the vehicle may
damage the vehicle. Load cargo
so that it rests evenly between
the crossrails, making sure to
fasten cargo securely.
To prevent damage or loss of cargo
when driving, check to make sure
cross rails and cargo are securely
fastened. Loading cargo on the roof
rack will make the vehicle's center
of gravity higher. Avoid high speeds,
sudden starts, sharp turns, sudden
braking, or abrupt maneuvers;
otherwise it may result in loss of
control. If driving for a long distance,
on rough roads, or at high speeds,
occasionally stop the vehicle to
make sure the cargo remains in its
place. Do not exceed the maximum
vehicle capacity when loading the
vehicle. For more information on
vehicle capacity and loading, see
Vehicle Load Limits on page 9 21.
The roof rack cross rails can be
locked in four positions along the
roof rack side rails. These are the
only positions that the cross rails
will lock.
Storage
Lift the lever to release and move
the cross rail.
Position the cross rail on both sides
of the vehicle at the same time.
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