Pontiac 2001 Montana Owner's Manual page 194

NOTICE:
Loading cargo that weighs more than 150 lbs. (68 kg)
on the luggage carrier may damage your vehicle.
When you carry cargo on the luggage carrier of a
proper size and weight, put it on the slats, as far
forward as you can. Then slide the crossrail up
against the rear of the load, to help keep it from
moving. You can then tie it down.
2-82
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.
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.
Your luggage carrier has
release knobs set in the ends
of each crossrail.