1995 GMC Yukon 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. 2-86