I. Project Background and Real-World Case: Sewage Treatment Vehicle Procurement by Bengbu Municipal Sanitation Department In 2024, a municipal sanitation department in Bengbu City, Anhui Province, publicly tendered for a batch of specialized sewage treatment vehicles, intended for emergency handling of urban sewage pipelines, river dredging, and industrial wastewater transportation. Based on publicly available tender information, the project budget was capped at approximately RMB 2.219 million, with plans to procure five Dongfeng Yizhan-style sewage treatment vehicles at a unit price of around RMB 350,000–400,000. After multiple rounds of evaluation, Chengli Special Purpose Vehicle Co., Ltd. (hereinafter referred to as "Chengli") secured the contract with its CLW5180GSSD6 model’s official announcement parameters and factory-direct sales advantage, ultimately delivering five units. These vehicles are built on Dongfeng chassis compliant with China VI emission standards, featuring an expandable (wing-type) body design for convenient loading and unloading, and equipped with high-power vacuum pumps and sewage separation systems. Customer feedback indicates stable operation, with an average daily sewage processing capacity exceeding 80 cubic meters per vehicle and relatively low maintenance costs. Chengli’s comprehensive after-sales support—including nationwide Dongfeng chassis warranty and lifetime upper-structure service—ensures efficient and reliable equipment operation. Notably, the Bengbu project is not an isolated case. Chengli has accumulated extensive similar delivery experience across Anhui Province and neighboring regions—for example, Henan Provincial Sanitation Bureau procured ten 5-cubic-meter water-sprinkling trucks (reference model CLW5070GSSD6), while Sichuan municipal authorities deployed four cleaning-and-suction sewage trucks. These precedents provide a solid foundation for cross-regional replication. II. Experience Replication: How Adjacent Provinces and Cities Can Adopt the Bengbu Model The success of the Bengbu project was quickly adopted by neighboring provinces and cities. For instance, the Urban Management Bureau of a district in Xuzhou City, Jiangsu Province, and the environmental maintenance unit of a subdistrict in Jining City, Shandong Province, launched similar sewage treatment vehicle procurement initiatives in 2025, drawing upon key elements from the Bengbu solution: Vehicle Selection: Priority was given to Dongfeng-chassis Yizhan-style models due to their complete official announcements, nationwide registration eligibility, and readily available chassis components. Chengli’s CLW5180GSSD6 model announcement parameters confirm compliance with China VI standards across overall dimensions, wheelbase, and emissions—making it suitable for diverse operational scenarios. Budget Control: Aligning with local procurement practices, the Xuzhou project budget was set at approximately RMB 1.997 million, while the Jining project budget stood at roughly RMB 2.441 million—both referencing Bengbu’s unit price range (RMB 350,000–400,000/unit) and incorporating a 10% contingency margin. After-Sales Assurance: Chengli committed to nationwide Dongfeng chassis warranty coverage and lifetime upper-structure service, with spare parts dispatched within 24 hours—effectively alleviating concerns associated with inter-provincial procurement. In practical implementation, the Xuzhou client requested enhanced remote monitoring functionality; Chengli delivered a customized solution by integrating an IoT module into the wing-type body, enabling real-time data transmission. The Jining client prioritized processing capacity; Chengli optimized the vacuum pump parameters, raising the average daily processing volume per vehicle to 90 cubic meters. All such adaptations were implemented within the CLW5180GSSD6’s officially announced framework without altering core structural configurations—thus preserving registration eligibility and