Power Winches; Step-Bumper Pad - GMC 2003 Yukon Owner's Manual

Power Winches

If you wish to use a power winch on your vehicle, only
use it when your vehicle is stationary or anchored.

Step-Bumper Pad

Your vehicle has a rear step bumper with a rear step
pad at the center of the bumper.
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If your step-bumper has only one cutout circle, you will
have to cut out the circle, then remove it to install
the trailer ball.
If you will be using the
bumper to tow a trailer,
and your step-bumper has
three cutout circles you
must push out the center
cutout circle to install
the trailer ball.