The Jeep Liberty retains its 210-hp, 3.7L V6 engine, mated to a 4-speed automatic transmission, a package capable of towing up to 5000 pounds. There are three models, the Sport, Limited and the Limited Jet. All are available in rear-wheel or 4-wheel drive. Two 4-wheel drive systems are also available: the standard, part-time Command-Trac or the available full-time Selec-Trac II. The Sport models may be the entry-level Liberty, but they are well-appointed and capable, featuring 17-inch aluminum wheels, heated mirrors and remote keyless entry. 4-wheel drive Libertys come with Jeep's part-time Command Trac II system. The Limited features silver-accent wheels, chrome roof rails and grille, fog lamps, leather seats and steering wheel audio controls. The Jet pushes the wheels to 20-inch aluminums, heated leather power-adjustable seats, a leather-wrapped steering wheel, wood trim and an upgraded instrument panel. The optional Sky Slider roof is a panoramic sunroof with one of the largest openings in the class. It's available on all Libertys. All Libertys are upgradeable to a very capable Selec-Trac II full-time 4-wheel drive system, a full-size spare and a high-end stereo that includes SIRIUS, touch-screen, navigation and Bluetooth. The Liberty carries a raft of standard safety systems such as electronic stability control, anti-lock brakes, traction control, brake assist and electronic roll mitigation. Hill descent control and start assist, important off-road features, are included on all Libertys. With the Liberty's high ground clearance, these aides will likely get at least a few drivers out of difficult situations. The Sport has a tire pressure monitoring warning system as standard equipment, while the Limited gets a more advanced tire pressure monitor.