When selecting a 15-ton truck crane, you must prioritize the Maximum Lifting Capacity (15,000kg) and the Fully Extended Boom Length, which typically ranges from 28 to 35 meters. Pay close attention to the Load Moment Indicator (LMI) system accuracy and the Hydraulic Pump brand (e.g., Rexroth or high-quality domestic equivalents), as these determine the smoothness of operation and safety. Ensure the chassis is from a reputable manufacturer like Sinotruk, Shacman, or Dongfeng to guarantee engine reliability and ease of finding spare parts.