Cadillac 2004 SRX - Manual (Page 114)

Luggage Carrier
{ CAUTION:
If you try to carry something on top of your
vehicle that is longer or wider than the luggage
carrier — like paneling, plywood, a mattress
and so forth — the wind can catch it as you
drive along. This can cause you to lose
control. What you are carrying could be
violently torn off, and this could cause you or
other drivers to have a collision, and of course
damage your vehicle. You may be able to carry
something like this inside. But, never carry
something longer or wider than the luggage
carrier on top of your vehicle.
If you have the luggage carrier, you can load things on
top of your vehicle. The luggage carrier has side
rails attached to the roof. You can get sliding crossrails
through your dealer to use for tying things down.
These let you load some things on top of your vehicle,
as long as they are not wider or longer than the
luggage carrier.
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