A combined fifth wheel lift and slider assembly mountable on a truck frame includes a fifth wheel slidably mounted upon a fifth wheel slider assembly, and vertically elevatable by a frame member; the frame member supporting the fifth wheel slider assembly, the frame member being moveable from a resting position wherein the frame member rests substantially horizontal relative to the truck frame, to an actuating position wherein the frame member is positioned at an angle relative to the truck frame; a hydraulic mechanism for moving the frame member from the resting position to the actuating position wherein the hydraulic mechanism extends upwardly to push the frame member, the fifth wheel assembly, and the fifth wheel in a direction away from the truck cab; and a locking mechanism for securing the frame member in the resting position.

A system and method for steering a trailer include the trailer being coupled to a fifth wheel of a motor vehicle. A trailer steering system for the motor vehicle includes a sliding rail mounted on a vehicle frame of the motor vehicle and extending along a lateral direction of the motor vehicle, a slider slidingly arranged on the sliding rail and carrying the fifth wheel for coupling the trailer to the motor vehicle, and a control device configured to control movement of the slider along the sliding rail depending on a current steering angle of the motor vehicle.

A system for controlling the distance between a vehicle and a trailer. The vehicle and the trailer form a vehicle combination. The system comprises a fifth wheel mounted on the vehicle and configured to couple the trailer to the vehicle, a linear guide for guiding the fifth wheel such that the fifth wheel performs a longitudinal motion along the vehicle, and a controller configured to control a fifth wheel position on the basis of at least one of a preferred front and/or rear axle load and data associated with an upcoming event, to thereby set the distance between the vehicle and the trailer.

A single axle dolly vehicle unit for a heavy duty vehicle combination, the dolly vehicle unit comprising an electrical energy source arranged to power at least one electric machine configured to drive left and right wheels of the single axle, the dolly vehicle unit further comprising a drawbar and a fifth wheel connection for mating with first and second trailer units, respectively, wherein the fifth wheel connection is arranged to be adjusted in height over ground by a variable height suspension system, the dolly vehicle unit further comprising a control unit arranged to control the variable height suspension system.

A dynamically adjustable gooseneck mount has a linear actuator that is removably affixed to a towing vehicle over the vehicle's rear axle. A gooseneck ball is affixed to a movable portion of the actuator and can move between a forward position and a rearward position through operation of a motor. The mount includes a sensor that can sense a flag that is attached to the coupler on a trailer. When the sensor detects the flag, the motor moves the gooseneck ball forward. If the towing vehicle and trailer are at a sufficient angle with respect to each other, the sensor no longer detects the flag and moves the gooseneck ball rearward. In the forward position, the gooseneck ball is forward of the axle and in the rearward position, the gooseneck ball is behind the axle.