Scania-Vabis’ first post-war model, the L10 had been introduced already in 1944. Two years later came the larger L20, with a six-cylinder variant of the company's module engine which had been introduced in the late 1930s. The truck was also offered with a trailing axle. This version was called the LS20, with an “S” for "support axle". The largest bogie vehicle had a payload capacity of 10.2 tonnes.
In the spring of 1954, the final development of Scania-Vabis’ six-cylinder module engines was introduced, with larger displacement. The trucks were renamed L71/LS71 Regent and received air brakes. From the autumn of 1955, they could also be ordered with power steering.