Chevrolet VENTURE 2001 Manual page 194

Luggage Carrier (Option)
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 optional luggage carrier, you can load
things on top of your vehicle. The luggage carrier has
slats and side rails attached to the roof, as well as sliding
crossrails and places 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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