The add-on system enables an individual customer configuration tailor made for their needs. For example keeps the tiltable upper carriage the operator environment levelled in steep slopes. An optimized main boom for improved kinematic as well as an extension with hidden hose routing further improves reach and productivity. Further useful options such as climbing support bars mounted on the tracks, a hydraulic winch, the Power-Boost-Hydraulic-Accumulator or an additional rear weight comlete the KDH offering. The purchase- and operational costs stay economical even with that versatil offer. A low weight and compact design make transports simple and easy.