I. Project Background: Joint Procurement Across Multiple Counties to Enhance Drainage Network Operation and Maintenance Efficiency In early 2026, municipal sanitation departments in several counties under Dali Bai Autonomous Prefecture (hereinafter referred to as 'a municipal sanitation department') faced challenges during their annual sewer cleaning and maintenance work: narrow alleys in old urban areas and severe sedimentation in underground pipelines. Conventional large-scale sewer cleaning trucks could not access these areas, while manual cleaning was inefficient and posed significant safety risks. After investigation, the blue license plate 3-cubic-meter sewer cleaning truck (based on the Dongfeng dual-cab chassis) emerged as the preferred solution due to its compact body (capable of navigating rural-urban fringe alleyways), C-class driver’s license compatibility, and exemption from vehicle purchase tax. To reduce procurement costs and standardize maintenance protocols, three districts/counties under Dali Prefecture adopted a joint procurement model: coordinated by the prefectural-level supervisory authority, demand volumes were aggregated (approximately 15 units total), and a unified tender notice was issued. Budgeting followed local procurement conventions, with an estimated unit cost for each blue license plate 3-cubic-meter sewer cleaning truck ranging from RMB 130,000 to 160,000 (per publicly available tender information), resulting in a total budget of approximately RMB 2.264 million to 2.717 million. II. Unified Technical Standard Development: Ensuring Compliance and Performance During preparation of the tender documents, the procuring entity referenced MIIT-announced technical parameters and industry standards to define the following core technical requirements: Chassis & Emission Standard: Dongfeng dual-cab cab; China VI emission standard; blue license plate (gross vehicle weight ≤ 4.5 tons); operable with a C1 driver’s license. Tank Capacity: Effective volume ≥ 3 cubic meters; constructed from high-strength steel with anti-corrosion treatment. Sewer Cleaning Functionality: Equipped with a high-pressure cleaning pump (pressure ≥ 10 MPa), vacuum suction pump (maximum suction depth ≥ 6 m), hydraulic hose reel, and 15–20 meter suction hose. Safety Features: Tank overfill alarm, hydraulically locked rear cover, and night-vision operation lighting. After-Sales Service: Chassis covered by original manufacturer’s nationwide warranty; superstructure (tank, pump assembly, hydraulic system) requires lifetime service support, with spare parts dispatchable within 24 hours. Ultimately, Chengli Special Purpose Vehicle Co., Ltd. (hereinafter 'Chengli') won selection with its CLW5040GQW6 sewer cleaning truck—customized on the Dongfeng dual-cab chassis—which fully met all the above specifications. The model is fully certified and compliant for registration and annual inspection nationwide. III. Centralized Tendering and Chengli’s Bulk Supply Advantages Following open tender evaluation (using a comprehensive scoring method: 40% technical score, 50% price score, 10% service score), Chengli Special Purpose Vehicle secured the contract at an average unit price of approximately RMB 142,000 (per publicly available tender data), totaling approximately RMB 2.13 million. Its competitive advantages included: Direct factory supply with outstanding cost-effectiveness: Chengli is headquartered in Suizhou, Hubei—the national hub for special-purpose vehicle manufacturing—with no intermediary distribution channels. According to internal database records, same-specification vehicles purchased directly from Chengli are RMB 8,000–15,000 cheaper per unit than those sourced via 4S dealerships. This joint procurement of 15 units yielded direct cost savings of approximately RMB 120,000–220,000. Short delivery lead time: Leveraging Suizhou’s localized production capacity and a zero-inventory shipping model, standard models can be delivered within 7–15