helps give an increased towing capacity of up to . The engine is tied to a six-speed sequential-shift automatic transmission with an all-new 4WD system which uses a Torsen center differential. Development began on both the Land Cruiser (J200) and Lexus LX equivalent in 2002. The final design was approved in 2004, with testing being conducted into early 2007 on development prototypes and late 2007 on pre-production models. The final design patent for the J200 series Lexus LX was filed on March 27, 2007. The LX 570 is longer overall and wider, while retaining the same wheelbase. It loses the plastic lower body side cladding leaving the paint exposed. A third of the frame's body mass is made from high-tensile steel, along with the entire B-pillar, and all three crossmembers are hydroformed steel. Like the Toyota Tundra the tow hitch is integrated into the frame. The front suspension now uses double wishbones, replacing the torsion beam, which gives of suspension travel, while the rear continues to use a multi-link suspension with a solid rear axle for strength and durability. The LX platform has logged 240,000 test kilometers through subtropical forests, the Australian Outback and American deserts. The LX 570 comes standard with 20-inch wheels, a four-wheel electro-hydraulic suspension with an updated six-setting AHC system that can raise the vehicle by or lower it by from its normal ride height using a knob in the center console. The front suspension's air bag spring rates are variable, but not continuously like a fully active suspension arrangement. The AVS provides more immediate damper firmness adjustments that are diagonally cross-linked through a mechanical system using hydraulic fluid, similar to the 4Runner's X-REAS system. Other performance features include a Crawl Control (more advanced version of Downhill Assist Control) system that negotiates off-road obstacles in both forward and reverse at low speeds by automatically providing throttle and braking inputs for less experienced off-road drivers: an interior lever allows the driver to reduce speed. A multi-terrain anti-lock braking system gives shorter stopping distances on surfaces such as sand or gravel. Hill-start Assist Control (HAC) prevents rolling backwards on hills or slippery surfaces. The interior includes amenities, standard and optional, featured in the 2007 LS 460, such as semi-aniline leather seats, four-zone climate control, a 19-speaker 450 Watt Mark Levinson surround-sound stereo system with hard-drive memory storage, a hard-drive-based navigation system, XM satellite radio with NavTraffic as standard,