Second-hand trading market in South Gate. According to Baidu map information, the second-hand market address of Xining dump truck is located in the second-hand trading market at the south gate of Le Kang New Village in Chengdong District of Xining. Xining, formerly known as Qing Tang Cheng, Xiping County and Shanshan, is the capital of Qinghai Province and an important central city in northwest China approved by the State Council.