Abstract: The invention relates to a mobile unit for mobile machines having extensible support devices comprising a first, continuous rigid support on which travel devices and some of the support devices are arranged and on which a further continuous support or divided support arms, which support the remaining support devices, are outwardly pivotably linked. In accordance with the invention, the first, continuous rigid support is aligned at an angle to the imagined longitudinal axis of the mobile unit and the further continuous support or the divided support arms are aligned with point symmetry to a real or imagined pivot point on the continuous rigid support, with them likewise supporting travel devices.