GMC 2008 Yukon Denali Owner's Manual page 331

If you use a step-bumper hitch, the bumper could be
damaged in sharp turns. Make sure there is ample room
when turning to avoid contact between the trailer and
the bumper.
If you will be pulling a trailer that, when loaded, will
weigh more than 5,000 lbs (2 270 kg) be sure to use a
properly mounted weight-distributing hitch and sway
control of the proper size. This equipment is very
important for proper vehicle loading and good handling
when driving. Always use a sway control if the trailer
will weigh more than these limits. You can ask a
hitch dealer about sway controls.
Hitch Cover
Your vehicle may have a hitch cover. To remove the
hitch cover:
1. Turn the fasteners on the lower tabs 90 degrees
counterclockwise.
2. Lift the lower edge of the cover about 45 degrees.
3. Pull the cover downward to disengage the upper
attachments.
To reinstall the hitch cover:
1. Hold the cover at a 45 degree angle to the vehicle
and push the upper tabs in the hitch cover into the
chrome slots in the fascia.
2. Move the bottom of the cover forward until the
lower tabs line up with the lower fascia slots.
3. Snap the hitch cover into place by pushing the
upper corners forward.
4. Turn the fasteners on the lower tabs 90 degrees
clockwise to lock the cover in place.
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