Government Procurement Case and Solution Analysis of the Baotou National VI Dongfeng 3308 mm Wheelbase Sewage Treatment Vehicle. In autumn 2025, the municipal sanitation department of a district in Baotou City, Inner Mongolia, faced an urgent challenge: long-standing blockages in septic tanks and sewage wells across multiple old residential communities. Conventional vacuum suction trucks suffered from small capacity and low efficiency, while large vehicles could not access narrow roads in certain areas. During the monthly routine meeting, Director Wang, the department head, explicitly stated: “We need a fleet of vehicles capable of both high-efficiency suction and on-site treatment and separation—preferably built directly on existing Dongfeng chassis to reduce procurement and operational maintenance costs.” This requirement directly triggered subsequent evaluation and procurement of Chengli Special Purpose Vehicles’ National VI Dongfeng 3308 mm wheelbase sewage treatment vehicle. I. Requirement Identification: Leadership’s Pain Points and Objectives Director Wang pointed out that, over recent years, the department had primarily relied on rented third-party vehicles and a limited number of aging vacuum suction trucks—resulting in three major pain points: • Low Efficiency: Each suction truck could carry only approximately 3–5 m³ per trip; frequent round-trips to treatment plants consumed substantial time, especially during peak hours when queues were severe. • Environmental Pressure: High risk of sewage leakage during transport, and off-site treatment increased the likelihood of secondary pollution. • Road Condition Constraints: Some community roads were less than 3 meters wide, preventing access by large vehicles and creating service blind spots. “We are not purchasing simple vacuum suction trucks—we need mobile wastewater treatment stations capable of on-site operation, rapid processing, and adaptation to complex road conditions,” emphasized Director Wang. Following internal discussions, preliminary selection criteria focused on National VI emission compliance, short wheelbase (~3308 mm), and integrated solid-liquid separation functionality. Budget-wise, based on local procurement practices, the unit cost was targeted at RMB 200,000–300,000, with a total budget capped at RMB 1,122,000 for 2–3 units. II. Internal Selection Process: Balancing Technical Specifications and Cost-Effectiveness Subsequently, the department’s Technical Division conducted comparative evaluations of multiple models available on the market. Key parameters under scrutiny included chassis wheelbase (affecting maneuverability), tank volume (directly impacting single-operation capacity), suction depth, and presence of an integrated sewage treatment system. During screening of Chengli Special Purpose Vehicles’ product portfolio, its National VI Dongfeng 3308 mm wheelbase sewage treatment vehicle (model reference: modified version based on CLW5070GSSD6 chassis) stood out across several critical dimensions: • Chassis: Dongfeng chassis with 3308 mm wheelbase and National VI emissions compliance—ideal for tight urban turning radii and U-turns. • Tank: 3–4 m³ sewage tank, optimally matched to wheelbase and payload capacity to meet single-operation requirements. • Functionality: Equipped with vacuum pump and sewage separation unit enabling on-site solid-liquid and dry-wet separation—significantly reducing transport frequency. • Certification: Fully compliant with national type-approval regulations, enabling nationwide registration and annual inspection. During discussions, Section Chief Li of the Technical Division remarked: “Compared with peer-priced models from other brands, Chengli’s advantage lies in its more compact upper-structure design and clearly identified core component suppliers (e.g., vacuum pumps), ensuring reliable after-sales maintenance support. Moreover, Chengli’s direct factory sales model offers savings of approximately RMB 8,000–15,000 per un