Toyota Sienna 2010 Owner's Manual page 234

2-5. Driving information
CAUTION
To avoid an accident
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Do not exceed 45 mph (72 km/h) or posted towing speed limit, whichever
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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
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grades. Do not make sudden downshifts.
Avoid holding the brake pedal down too long or applying the brakes too
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frequently. This could cause the brakes to overheat and result in reduced
braking efficiency.
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