Toyota SIENNA 2011 Quick Reference Manual page 389

2-5. Driving information
CAUTION
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Trailer towing precautions
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Follow all the instructions described in this section. Failure to do so could
cause an accident resulting in death or serious injury.
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Exceeding the towing capacity, GVWR, GCWR or GAWR can cause an
accident resulting in death or serious personal injuries.
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To avoid accident or injury
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Do not exceed the trailer hitch assembly weight, gross vehicle weight,
gross axle weight and trailer tongue load capacities.
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Never load more weight in the back than in the front of the trailer. About
60 % of the load should be in the front half of the trailer, and the remaining
40 % in the rear.
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Do not exceed 45 mph (72 km/h) or posted towing speed limit, whichever
is lower. As instability (swaying) of the towing vehicle-trailer combination
increases as speed increases, exceeding 45 mph (72 km/h) may cause
loss of control.
●
Slow down and downshift before descending steep or long downhill
grades. Do not make sudden downshifts.
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Avoid holding the brake pedal down too long or applying the brakes too
frequently. This could cause the brakes to overheat and result in reduced
braking efficiency.
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Do not use cruise control when you are towing.
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Do not tow the vehicle with the compact spare tire installed.
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