The RX series was first introduced in 1998 and is a mid-size luxury crossover SUV that is still on the market today. The RX has been available in both front-wheel and four-wheel-drive configurations over its years of production. The Lexus RX body style features a 5-door SUV and has been labeled as both a compact luxury crossover SUV and a mid-size luxury crossover SUV, depending on its generation. From 1998 to present, the Lexus RX has gone through four generations of technology and style changes, including the XU10, XU30, AL10, and the AL20.