2005 GMC Envoy Owner's Manual - Page 129

A luggage carrier allows you to load things on top of your vehicle. The luggage carrier has side rails attached to the roof, sliding crossrails (if equipped) and places to use for tying things down. These let you load some other things on top of your vehicle, as long as they are not wider or longer than the luggage carrier. To slide the crossrails to where you want them, pull up on the lever on each side of the crossrail. This will release the crossrail and allow you to slide it. When the crossrail is where you want it, press down on the levers to lock it into place. 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. Don't exceed the maximum vehicle capacity when loading your vehicle. For more information on vehicle capacity and loading, see Loading Your Vehicle on page 4-43. To prevent damage or loss of cargo as you're driving, check now and then to make sure the luggage carrier is locked and cargo is still securely fastened. When the luggage carrier is not in use, place the crossrails at the following positions for wind noise reduction. Place one crossrail at the rear most point of the vehicle and the other crossrail above the opening of the rear door. 2-55