A kingpin crossbeam accessory enables two mobile lifting columns to securely engage a trailer at the kingpin, while additional columns lift the rear of the trailer at the wheels, creating a synchronized three-point lifting system. This configuration provides a safe, stable, and efficient method for raising unsupported trailers for maintenance and repair without the need for a tractor. By bringing the mobile lifting system directly to the trailer's location in the yard or storage area, technicians benefit from improved ergonomics, greater flexibility, and increased service efficiency.