Trailer vehicle, with - a transport platform for transport containers, characterised by - a signal processing device, - at least one sensor for detecting a position of a transport container and/or a truck relative to the trailer vehicle and for generating a sensor signal, - signal transmission device for transmitting a signal between the trailer vehicle and the truck or a display device, or for transmitting a signal between the trailer vehicle and the truck and a display device; and - a target signal generator for providing a target position (160, 170) of the transport container and/or truck relative to the trailer vehicle, wherein - the signal processing device is connected to the at least one sensor, the target signal generator and the signal transmission device and is configured, - for determining an actual position (160', 170') of the transport container and/or truck relative to the trailer vehicle from the sensor signal of the at least one sensor, - for comparing the actual position (160', 170') with the target position (160, 170) of the transport container and/or truck relative to the trailer vehicle, and - for generating guidance information for transferring a transport container from the truck to the trailer vehicle and/or for unloading the trailer vehicle in the reverse direction, based on a deviation between the actual position (160', 170') and the target position (160, 170) of the transport container and/or truck relative to the trailer vehicle, such that - the guidance information contains control instructions for such control interventions on the truck and/or a loading device, which have the effect of reducing the deviation between the actual position (160', 170') and the target position (160, 170) of the transport container and/or truck relative to the trailer vehicle, and wherein - the signal transmission device is adapted to transmit the guidance information to the truck and/or to a display device for a driver. - a transport platform for transport containers, - a signal processing device, - at least one sensor for detecting a position of a transport container and/or a truck relative to the trailer vehicle and for generating a sensor signal, - signal transmission device for transmitting a signal between the trailer vehicle and the truck or a display device, or for transmitting a signal between the trailer vehicle and the truck and a display device; and - a target signal generator for providing a target position (160, 170) of the transport container and/or truck relative to the trailer vehicle, - the signal processing device is connected to the at least one sensor, the target signal generator and the signal transmission device and is configured, - for determining an actual position (160', 170') of the transport container and/or truck relative to the trailer vehicle from the sensor signal of the at least one sensor, - for comparing the actual position (160', 170') with the target position (160, 170) of the transport container and/or truck relative to the trailer vehicle, and - for generating guidance information for transferring a transport container from the truck to the trailer vehicle and/or for unloading the trailer vehicle in the reverse direction, based on a deviation between the actual position (160', 170') and the target position (160, 170) of the transport container and/or truck relative to the trailer vehicle, such that - the guidance information contains control instructions for such control interventions on the truck and/or a loading device, which have the effect of reducing the deviation between the actual position (160', 170') and the target position (160, 170) of the transport container and/or truck relative to the trailer vehicle, and wherein - the signal transmission device is adapted to transmit the guidance information to the truck and/or to a display device for a driver.