Many engineering solutions have been proposed formulti-axle steering applications. Zhao et al.10 utilizedan electro-hydraulic proportional control system toobtain coordinated steering for the TLC900 girdertransport vehicle used for constructing high-speed railroads. Li et al.11 proposed a network control steeringsystem with proportional valves for large-scale transportation vehicles to achieve smooth and accurate steering motion without slipping or sliding. Tian et al.12used a similar electro-hydraulic proportional steeringsystem for elevated platform trucks.