Self-Propelled Modular Transporters (SPMTs), or self-propelled module vehicles, consist of various modules with 4, 5, 6, or 8 axle lines. The load capacity varies depending on the specific version and can reach up to a maximum of 44 tons per axle line. Each module can be equipped with its own engine and control system (steering system). The modules can be coupled sideways and/or lengthwise, creating large „mobile platforms.“ SPMT wheels feature 360-degree steering, enabling rotational and lateral movements. Their deck height can be hydraulically adjusted by approximately 60 cm, allowing for vertical lifting or lowering of the load. Thanks to their versatility, SPMTs can handle and transport virtually all heavy loads. These trailers are primarily used for short-distance transportation on construction sites.