A method for displaying an environment of a vehicle having a coupled trailer. The method includes: recording a sequence of vehicle camera images using at least three vehicle cameras; recording a sequence of trailer camera images using the trailer camera; acquiring odometry data of the vehicle; ascertaining the trailer angle; storing items of image information about the close range of the vehicle; adjusting the position of the stored items of image information as a function of the detected odometry data; and displaying an environment model from a virtual observational perspective, preprocessed current vehicle and trailer camera images being projected onto a projection area of the environment model and being joined. For partial areas of the environment of the vehicle that are not represented, the stored items of information are projected onto the projection area according to their position and are joined to the vehicle and trailer camera images.

A trailer platform system with independent propulsion and control includes a steerable first axle connected to a pair of first wheels, a second axle connected to a pair of second wheels, and at least one electric traction motor configured to drive the steerable first axle and/or the second axle. A high voltage battery system is configured to power the at least one electric traction motor. A load platform is supported by a chassis and a suspension, wherein the load platform is a wagon-style platform with the first and second wheels located at the four corners of the load platform. A lead vehicle hitch connection is configured to removably couple to a lead vehicle.

An auxiliary hydraulic system including an accumulator, a control valve, and a hydraulic connector. The accumulator connects to a primary hydraulic system including a hydraulic pump, a brake circuit, and a steering circuit. The control valve selectively allows or prevents flow from an accumulator to at least one of the brake circuit and the steering circuit. The hydraulic connector selectively connects an external source to the accumulator and the control valve.

A control device and method for controlling a tag axle steering system, configured to steer tag axle wheels of a tag axle, are provided. The method comprises, when the steering angle of the tag axle wheels is offset from a steering angle of a neutral position of the tag axle wheels and in response to a fault signal indicating malfunction of the tag axle steering system, locking the position of the tag axle wheels at a current steering angle of the tag axle wheels. A computer program and a computer-readable medium, as well as a vehicle, are also disclosed.