Ford 1998 Windstar Owner's Manual page 228

Driving
Four Season Roof Rack (If equipped)
Always load your luggage as far back as it will safely go on the
four season roof rack. Do not load more than 165 pounds
(75 kg) on the roof rack structure or 100 pounds (45 kg) on the
roof panel slats. Be careful that your vehicle does not exceed the
Gross Vehicle Weight Rating (GVWR) or its Gross Axle Weight
Rating (GAWR front and rear). The GVWR and GAWR are
located on the Safety Compliance Certification Label (located on
the driver's door pillar).
The four season roof rack
The rear cross-bar can be adjusted forward and backward. Place
your luggage between the bars, adjust the rear bar, and secure
the luggage with rope to the bars. Items carried on the roof
rack must be properly secured before driving your vehicle.
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