GMC Yukon 2021 Owner's Manual page 94

Storage 93
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 0 222.
A Center High-Mounted Stoplamp (CHMSL) is
located above the rear window glass. Make
sure items loaded on the roof of the vehicle
do not block or damage the CHMSL.