With the RX 300, Lexus became a pioneer in what came to be called "hybrid" or "crossover" vehicles, which blend the attributes of a truck and a passenger car. Introduced as an early 1999 model, it quickly became the top Lexus seller. Available with front-wheel drive or permanent all-wheel-drive, the new-wave four-door SUV was based partly on a passenger-car platform, but had a personality all its own. Exterior dimensions were similar to Jeep's Grand Cherokee, with a 7.5-inch ground clearance. Absence of low-range gearing marked Lexus's new model as an all-weather on-road wagon, rather than a true off-road 4x4. Sole powertrain was a 3.0-liter V6 engine with variable-valve timing, coupled to a four-speed automatic transmission. The gearshift lever protruded from the center console. Towing capacity was 3500 pounds. Seat-mounted front side airbags and antilock all-disc brakes were standard. Handy touches included full automatic-up/down power windows, two tiers of drawers in the center console, and large map pockets in each door. Two small underfloor bins flank a covered spare-tire well.