GMC 1995 Suburban Owner's Manual page 158

Securely attach the harness to the trailer, then tape or strap it to your
vehicle's frame rail. Be sure you leave it loose enough so the wiring won't
bind or break when turning with the trailer, but not so loose that it drags on
the ground.
Store the harness in its original position. Wrap the harness together and tie
it
neatly so it won't be damaged.
If you do tow a trailer, your Center High Mount Stoplamp (CHMSL) may
not be properly visible from behind. You should select a trailer with a
CHMSL on it or, if one is not available, have one installed. See your GM
dealer about how to connect your vehicle's wiring to a trailer CHMSL.
Step-Bumper Pad
If your vehicle has a rear step bumper, it may be equipped with a rear step
pad at the center of the bumper. Use this pad to improve footing when you
are stepping on the bumper step.
If yo~r will be using
the bumper to tow a
trailer, you must
remove the center
cutout circle to install
the trailer ball. You
must also remove both
outer cutouts to attach
the trailer safety
chains.
To remove the pad, lift
the edge of the pad
from the rear of the
bumper and swing
it
forward. When the
pad releases from the
bumper holes, lift the
pad off.
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