Buick 2006 Rendezvous Owner's Manual page 135

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.
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 4-31.
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.
Loading things onto the luggage carrier can interfere
with the performance of your XM™ Satellite Radio
System, if equipped.
Your luggage carrier has release levers within the end
of each crossrail support.
2-41