Toyota Lexusc Owner's Handbook Manual page 175

EXTERIOR EQUIPMENT
D If driving for a long distance, on rough roads, or at
high speeds, stop the vehicle now and then during
the trip to make sure the cargo remains in its place.
D Do not exceed 75 kg (165 lb.) cargo weight on the roof
luggage carrier.
NOTICE
When loading the luggages, be careful not to scratch
the surface of the moon roof.
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