Case Study and Bid-Winning Solution Analysis: Zunyi Dongfeng Single-Cab Sewer Cleaning Truck (Blue License Plate, 5 m³) for Government Procurement. Due to frequent rainy seasons and high demand for urban drainage network maintenance in Zunyi, a municipal sanitation department recently completed the procurement of a batch of Dongfeng single-cab blue license plate 5 m³ sewer cleaning trucks. This procurement strictly followed a 'qualification review–based' process, with item-by-item verification conducted—from the manufacturer’s production license to anti-corrosion coating technology. This article uses this case to comprehensively deconstruct how legitimate suppliers are screened in government procurement and interprets Chengli Special Purpose Vehicle Co., Ltd.’s winning bid solution. I. Why Is 'Qualification Review' the First Step in Government Procurement? When procuring specialized vehicles such as sewer cleaning trucks, avoiding non-standard modified vehicles and those lacking complete regulatory documentation is the top priority. According to publicly released tender information, the department explicitly listed the following essential qualifications for certified manufacturers in its tender documents: • MIIT Announcement Directory: The vehicle model must be included in the MIIT’s 'Announcement of Road Motor Vehicle Manufacturers and Products', e.g., Chengli models such as CLW5070GSSD6. • CCC Certification: The complete vehicle must pass China Compulsory Certification (CCC), ensuring compliance with safety and emission standards. • China VI Emission Standard: All chassis must meet China VI emission requirements; in this case, Dongfeng chassis were selected. • Environmental Compliance Documentation: A certified emissions compliance document issued by environmental authorities must accompany each vehicle. • Specialized Vehicle Production License: The manufacturer must hold a special-purpose vehicle production qualification. Chengli Special Purpose Vehicle Co., Ltd. is an enterprise officially registered with the MIIT. How to Verify Production Licenses? Procurement entities typically verify credentials through the following channels: • MIIT Official Website: Enter the vehicle model (e.g., CLW5070GSSD6) to retrieve official announcement details. • CNCA (China National Certification and Accreditation Administration) Website: Verify authenticity of CCC certificates. • Manufacturer Qualification Documents: Suppliers must provide copies of business licenses and production licenses, stamped with official seals. • On-site Inspection: In this case, the procurement entity dispatched a delegation to Chengli’s industrial park in Suizhou, Hubei Province, to inspect production lines and quality control procedures. II. Special Requirements for Sewer Cleaning Trucks in Zunyi’s Humid, Hot Climate Located in Southwest China, Zunyi experiences high humidity and frequent rainy-season operations—posing higher performance demands on sewer cleaning trucks. The procurement entity explicitly emphasized the following technical requirements in its tender specifications: • Anti-Rust Coating: Tanks, pipelines, and chassis must employ electrophoretic coating or hot-dip galvanizing to prevent corrosion from prolonged exposure to sewage and rainwater. • Seal Durability in Humid-Hot Environments: Critical sealing components—including hydraulic systems and discharge valves—must utilize high-temperature- and corrosion-resistant materials to ensure no oil leakage or water seepage under humid conditions. • High-Load Performance: Given intensive rainy-season operation frequency, both engine and hydraulic pump must sustain continuous operation; this case specified a minimum engine power output of 85 kW. In response to these requirements, Chengli Special Purpose Vehicle implemented customized upgrades based on the Dongfeng chassis: utilizing the MIIT-announced CLW5070GSSD6 chassis model, applying epoxy resin anti-corrosion lining inside the tank, selecting impor