Expandable heavy equipment , comprising a frame with a first frame element , a connector , at least one elongated pull element , and further frame elements , the further frame elements comprising at least a second frame element , wherein the elongated pull element comprises a first coupler at a first end and a second coupler at a second end opposite of the first end , and is connected at the first end to the second frame element or to a second elongated pull element with the first coupler and at the second end to one of the further frame elements or to a further elongated pull element with the second coupler , a transport condition is defined wherein the first frame element and the second frame element are arrangeable compact together and a working condition is defined wherein the first frame element and the second frame element occupy more space in at least one direction than in the transport condition, the connector allows a movement of the first frame element and the second frame element with respect to each other from the transport condition to the working condition, and the connector is arranged for connecting the first frame element and the second frame element in the working condition, the elongated pull element is designed to transfer a pull force in the working condition, the elongated pull element comprises a bundle of load bearing fibres extending from the first coupler to the second coupler , and stiffening means for increasing the bending stiffness of the elongated pull element compared to the bending stiffness of the bundle of load bearing fibres , the stiffening means comprises an exoskeleton , characterised, in that the exoskeleton comprises one or more rods , provided outside of the bundle of load bearing fibres, and extending in a length direction of the elongated pull element. the elongated pull element comprises a first coupler at a first end and a second coupler at a second end opposite of the first end , and is connected at the first end to the second frame element or to a second elongated pull element with the first coupler and at the second end to one of the further frame elements or to a further elongated pull element with the second coupler , a transport condition is defined wherein the first frame element and the second frame element are arrangeable compact together and a working condition is defined wherein the first frame element and the second frame element occupy more space in at least one direction than in the transport condition, the connector allows a movement of the first frame element and the second frame element with respect to each other from the transport condition to the working condition, and the connector is arranged for connecting the first frame element and the second frame element in the working condition, the elongated pull element is designed to transfer a pull force in the working condition, the elongated pull element comprises a bundle of load bearing fibres extending from the first coupler to the second coupler , and stiffening means for increasing the bending stiffness of the elongated pull element compared to the bending stiffness of the bundle of load bearing fibres , the stiffening means comprises an exoskeleton , characterised, in that the exoskeleton comprises one or more rods , provided outside of the bundle of load bearing fibres, and extending in a length direction of the elongated pull element. <EOS>