TOYOTA 2010 Highlander - Manual (Page 225)

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2-5. Driving information
Trailer towing
Your vehicle is designed primarily as a passenger carrying vehicle.
Towing a trailer will have an adverse effect on handling, perfor-
mance, braking, durability, and fuel consumption. For your safety
and the safety of others, do not overload the vehicle or trailer.
To tow a trailer safely, use extreme care and drive the vehicle in
accordance with the trailer's characteristics and operating condi-
tions.
The vehicle stability and braking performance are affected by trailer
stability, brake setting and performance, and the hitch.
Toyota warranties do not apply to damage or malfunction caused by
towing a trailer for commercial purposes.
Contact your Toyota dealer for further information about additional
requirements such as a towing kit.