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The Toyota Highlander has a powerful 3.5 liter V6 engine that delivers 295 horsepower and 263 lb.-ft. of torque. With the tow package, it can haul up to 5,000 pounds, or 3,500 pounds in the hybrid model. Adding a tow package to your vehicle involves more than just installing a hitch – it also includes enhancements to the transmission's cooling system and a higher gear ratio in the rear end. While this will boost torque and towing capacity, it may result in reduced fuel efficiency for the Highlander. The package also includes trailer wiring connected to the taillights and improvements in braking and suspension durability.