As the company's cooperation with Volvo BM deepened, it started experimenting with getting rid of the front axle by permanently attaching the trailer and instead provide steering through hydraulic cylinders forcing the trailer and wagon to turn in relation to each other. This was made in analogue with systems already developed for use in tandem tractors (see for example Doe Triple-D). The first purpose built articulated hauler was DR 631, a 4x4, released in 1966 with a larger 6x6 model DR 860 being released in 1968. In 1974 Livab was absorbed into Volvo BM.