Outrigger assembly for support of mobile cranes, excavators and the like on the ground

An outrigger assembly for support of a mobile crane or excavator upon the ground, comprising a plurality of outriggers mounted to a vehicle frame and having free ends, wherein each of the outriggers has a ground-engaging pad connected to the free ends for vertical movement in relation to the ground, wherein each of the outriggers has at least one outrigger arm unit movable with respect to the vehicle frame between an idle position suitable for travel between sites, and an operative position suitable for support on the ground, wherein the outrigger arm unit includes an outrigger arm made of a hollow profile consisting of a lower part and an upper part of different configuration, wherein the lower part is of U-shaped configuration and the upper part is of inverted U-shaped configuration with a cross section that is different than a cross section of the U-shaped lower part.