Currently, AGVs (Auto Guided Vehicles) are the most widely used type of mobile robot in real world for logistics and intelligent manufacturing. While most of indoor AGVs do not have a special requirement on shock absorption systems, it remains a major concern for the outdoor AGVs' application. Compared with most of the current mono-spring absorption system designs, which means that all the spring dampers have identical elastic coefficient, dual-spring designs have an advantage in obstacle-crossing capability and shock absorption performances. This paper studies and validates the enhanced outdoor working performances of AGVs with dual-spring shock absorption systems. Theoretical dynamic analysis has been conduct to reveal the advantages in shock absorption characteristics. A series of simulation experiments have been performed to verify its advantages in stability and obstacle-crossing capabilities compared to conventional mono-spring absorption designs.