Lexus RX 450h 2010 Owner's Manual page 290

CAUTION
Hitches
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If you wish to install a trailer hitch, contact your Lexus dealer.
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Use only a hitch that conforms to the gross trailer weight requirement.
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Follow the directions supplied by the hitch manufacturer.
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Lubricate the hitch ball with a light coat of grease.
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Remove the trailer hitch whenever you are not towing a trailer. After removing
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the hitch, seal any mounting hole in the vehicle body to prevent entry of any sub-
stances into the vehicle.
When towing a trailer
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If the gross trailer weight exceeds 1000 lb. (450 kg), trailer brakes are required.
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Lexus recommends trailers with brakes that conform to all applicable federal and
state/provincial regulations.
Never tap into your vehicle's hydraulic system, as this will lower the vehicle's
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braking effectiveness.
Never tow a trailer without using a safety chain securely attached to both the
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trailer and the vehicle. If damage occurs to the coupling unit or hitch ball, there is
danger of the trailer wandering into another lane.
2-5. Driving information
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