Buick 1994 Roadmaster Owner's Manual page 114

Wagon Luggage Carrier
You have a luggage carrier and can load things on'top of
your vehicle. The luggage carrier has slats and side rails
attached to the roof, sliding crossrails and places to use
for tying things down. These let you load some things
on top of your vehicle, so long as they are not wider or
longer than the luggage carrier.
112