GMC Yukon Denali 2013 Owner's Manual page 116

4-4 Storage
Be sure the cargo is properly
loaded.
If small heavy objects are placed
on the roof, place the load in the
area over the rear wheels
(behind the rear side door on
Yukon XL Denali models).
If needed, cut a piece of 1 cm
(3/8 in) plywood to fit inside the
crossrails and siderails to spread
the load. If plywood is used, tie it
to the siderail supports.
Tie the load to the crossrails or
the siderail supports. Use the
crossrails only to keep the load
from sliding. To move the
crossrails, pull out on the latch
release handle at each end.
Slide the crossrail to the desired
position balancing the force side
to side. Push the release handle
back into the latched position
and slide the crossrail back and
forth slightly to be sure the latch
snaps securely into place.
If needed to carry long items,
move the crossrails as far apart
as possible. Tie the load to the
crossrails and the siderails or
siderail supports. Also tie the
load to the bumpers, but do not
tie the load so tightly that the
crossrails or siderails are
damaged.
To reduce wind noise, put the
front crossrail approximately
46 to 58 cm (18 to 24 inches) to
the front supports.
After moving a crossrail, be sure
it is securely locked into the
siderail.
A Center High-Mounted
Stoplamp (CHMSL) is located above
the rear window. Make sure items
are loaded on the roof of the
vehicle, do not block or damage the
CHMSL.
To prevent damage or loss of cargo
while driving, periodically stop and
check to make sure the luggage and
cargo is still securely fastened.