2005 Buick Rendezvous Owner's Manual - Page 131

If you have the luggage carrier with crossrails you can load things on top of your vehicle. If you do load things on the top of your vehicle, you must load them on the luggage carrier crossrails. Some vehicles may not have the crossrails. Notice: Damage may be caused to the roof of your vehicle if anything is placed directly on the roof. Notice: Loading cargo on the luggage carrier that weighs more than 220 lbs (100 kg) or hangs over the rear or sides of the vehicle may damage your vehicle. Load cargo so that it rests on the slats as far forward as possible and against the side rails, making sure to fasten it securely. When you carry cargo on the luggage carrier of a proper size and weight, put it on the slats and distribute the weight evenly. Then slide the crossrail, if equipped, up against the rear of the load to keep it from moving. You can then tie it down. Cargo containers must be loaded on the crossrails only. 2-41