Toyota's truck-based midsize SUV gains an optional 3rd-row seat and available rearview camera for 2004. 4Runner comes in SR5, Sport, and Limited models. Each offers a V6 with 4-speed automatic transmission or a V8 with 5-speed automatic. The V8 has less horsepower but more torque than the V6. Both engines are available with rear-wheel drive. V6s also offer 4WD that can be left engaged on dry pavement, and V8s offer all-wheel drive. Both systems include low-range gearing and a hill descent control designed to maintain a slow, steady speed down steep slopes. Hill ascent control--to avoid sliding backward--is standard for all models, as are antiskid/traction control and antilock 4-wheel disc brakes. Front torso side airbags and head-protecting curtain side airbags are available linewide. The curtain airbags are now designed to deploy when sensors detect an impending rollover. SR5s come on 16-inch wheels; others have 17s. A firmer suspension is standard on Sports, optional for Limiteds. A load-leveling rear air-spring suspension is available for V8 Limiteds. The available navigation system can be equipped with a video camera that displays a rear view on the dashboard screen when Reverse is selected. The new 2-passenger 3rd-row seat option joins an available rear-seat audio system. Rear DVD entertainment is optional. Towing capacity is 5000 lb. Toyota's Lexus luxury division sells an upscale AWD V8 4Runner with different styling as the GX 470.