The Doepker Jeep is the converter dolly that turns a tandem lowbed into a legal quad-axle configuration, or a tridem into a five-axle, without buying a new trailer. Positioned ahead of the main trailer and coupled through the fifth-wheel plate, it redistributes load across more axles to meet provincial and state oversize and overweight permit requirements. A steep-angle approach ramp lets it position cleanly under the main trailer without ground clearance problems on job sites.