To cut costs the first chassis were fitted with a live rear axle, but customers requested a more advanced DeDion axle to be fitted, which already came standard on the 150S.

Together with Captain of artillery Van der Trappen of the Dutch army, Hub van Doorne develops the TRADO construction, to convert a single driven rear axle into a double driven tandem axles.

Using the brothers' design, Melroe introduced the M60 Self-Propelled Loader and, in 1960, Louis added a rear drive axle, resulting in the M400 model, the world's first true skid-steer loader.[107]