1996 GMC Safari Owner's Manual - Page 107

Luggage Carrier (Option) If you have a luggage carrier, you can load things on top of your vehicle. The luggage carrier has slats, side rails and crossrails attached to the roof to secure cargo. The moveable tie downs, attached to the side rails, should be used to secure loads to the luggage carrier. Be sure the cargo properly loaded. Follow these guidelines: is Carrying small, heavy loads on the roof is not recommended. Tie the load to the moveable tie down, (two per each side of the side rails). Use the crossrails only to keep the load from sliding. NOTICE: Loading cargo thatweighs more than 200 lbs. (91 kg) on the luggage carrier may damage your vehicle. When you carry large things,never let them hang over the rear the sides of your or vehicle. Load your cargo so that it rests on the slats and does not scratch or damage vehicle. the Put the cargo against the side rails and fasten it securely to the luggage carrier. Put the main weight as far forward as can. you Don't exceed the maximum vehicle capacity when loading your vehicle. For more information on vehicle capacity and loading, see "Loading Your Vehicle" in the Index. If you need to carry long items, tie the load to the moveable tie downs provided in the side rails. Also tie the load to the bumpers. Do not tie the load so tightly that the crossrails or siderails are damaged. To prevent damage or loss of cargo as you're driving, check now and then to make sure the luggage carrier and cargo are still securely fastened.