I. Case Background: Sludge Transport Vehicle Procurement Requirement by Yinchuan Municipal Sanitation Department — By the end of 2025, a municipal sanitation department in Yinchuan issued a procurement plan for compact sludge self-dumping trucks to handle sludge transportation following urban drainage pipeline dredging. According to publicly released tender information, the project budget was capped at approximately RMB 283,000, with plans to procure two blue license plate, 3-cubic-meter sludge self-dumping trucks for sludge transfer across narrow streets, residential communities, and pipeline nodes. The procuring entity explicitly required vehicles equipped with cold-start capability and low-temperature hydraulic system stability to operate reliably under Yinchuan’s winter conditions of approximately -20°C. After multiple rounds of qualification review and technical proposal comparison, the Dongfeng D6 chassis-based, blue license plate, 3-cubic-meter sludge self-dumping truck solution offered by Chengli Special Purpose Vehicle Co., Ltd. (hereinafter 'Chengli') was selected and approved, and two units were successfully delivered. These vehicles are now operational in Yinchuan’s urban area; customer feedback confirms rapid engine start-up and stable hydraulic system performance under low-temperature winter conditions, significantly improving sludge removal efficiency. As a leading domestic special-purpose vehicle manufacturer, Chengli maintains complete product announcements (e.g., model CLW5070GSSD6), enabling nationwide registration and annual inspection compliance. Additionally, Chengli provides original-chassis nationwide warranty coverage and lifetime superstructure service—offering reliable assurance to the procuring entity. II. Qualification Review-Based Procurement Process: Essential Certification Checklist for Authorized Manufacturers — In government procurement projects, qualification review is the core step ensuring vehicle legality, regulatory compliance, and mitigation of post-procurement disputes. Based on this Yinchuan case, the procuring entity focused on reviewing the following documentation: Business License and Production Permit: Suppliers must hold a business license issued by China’s State Administration for Market Regulation, with business scope explicitly covering special-purpose vehicle manufacturing or sales. Chengli Special Purpose Vehicle Co., Ltd., located in Chengli Automobile Industrial Park, Economic Development Zone, Suizhou City, Hubei Province, possesses full special-purpose vehicle production qualifications and has served over 500 municipal sanitation entities. MIIT Announcement and Environmental Protection Announcement: Vehicles must be listed in the Ministry of Industry and Information Technology (MIIT)’s 'Announcement of Road Motor Vehicle Manufacturers and Products', granting legal registration eligibility. Chengli’s Dongfeng D6-based, blue license plate, 3-cubic-meter sludge self-dumping truck—model CLW5070GSSD6—is fully announced, with complete parameters compliant with China VI emission standards. CCC Certification: Vehicles must pass China Compulsory Certification (3C certification). All Chengli products hold valid CCC certificates, ensuring safety performance compliance. Chassis–Superstructure Consistency Documentation: Chassis must originate from mainstream manufacturers such as Dongfeng or Sinotruk, accompanied by official chassis certificates of conformity; the superstructure must be manufactured by Chengli’s original factory, supported by a full-vehicle certificate of conformity. The procuring entity verified consistency between chassis numbers, engine numbers, and MIIT announcement data. After-Sales Service Commitment Letter: Suppliers must submit a clear after-sales support plan, including nationwide chassis warranty and lifetime superstructure service commitment. Chengli guarantees nationwide Dongfeng chassis warranty coverage and lifetime superstructure service, with spa