 With over 300,000 wagons and its variants built in the U.S., it was one of Willys' most successful post-World War II models.For some time after the 1949 introduction of a four-wheel drive option, the 2WD was sold as "Station Wagon", while the 4WD was marketed as "Utility Wagon".The 4WD Willys Jeep Wagon is often considered the first production sport utility vehicle.