Case Background: First-time procurement by a newly established unit — a selection journey from scratch. In early 2025, a newly formed municipal sanitation department in a district of Xuchang City received an emergency assignment to treat river and domestic sewage within its jurisdiction. As this was their first procurement of such specialized equipment, the team lacked experience in the special-purpose vehicle market, vehicle specifications, and budget preparation. Department Head Mr. Li recalled: 'At that time, we had to learn even basic concepts like “wheelbase” and “official announcement model number” from scratch—let alone compare technical proposals from different manufacturers.' Facing imminent environmental assessment deadlines, the unit opted for a 'full-process consulting + open tendering' approach, entrusting an experienced supplier to provide technical solution support. At Chengli Special Purpose Vehicle Industrial Park in Suizhou, Sales Manager Zhang Yue (Phone: ) received this consultation request. Selection Pain Points: Why the Dongfeng 3308 mm Wheelbase Chassis? Following initial discussions, the Chengli team identified three core customer requirements: 1. Must comply with China VI emission standards to meet Xuchang City’s latest environmental access requirements; 2. The vehicle must balance maneuverability on narrow urban roads with sufficient treatment capacity—avoiding the dilemma of 'small vehicles lacking capacity' or 'large vehicles unable to enter'; 3. Budget capped at approximately RMB 386,000, aligned with local procurement precedents, aiming for a 'one-time purchase, long-term suitability' solution. Chengli’s Technical Department promptly reviewed the MIIT official announcement parameters (reference model CLW5070GSSD6) and determined that the Dongfeng 3308 mm wheelbase chassis (wheelbase: 3308 mm; curb weight approx. 4.5 tons) represents the optimal choice for this operational scenario: - Chassis sourced from Dongfeng, backed by nationwide warranty coverage and dense after-sales service network; - Upfit accommodates a 2–3 ton sewage tank and vacuum suction system, meeting routine emergency response needs; - Overall vehicle length kept within the ~6-meter class, qualifying for Blue License Plate registration and operable with a Class C driver’s license—lowering operator qualification barriers. Full-Process Consulting: From Technical Specifications to Budget Implementation Rather than quoting directly, Chengli first dispatched technical engineers to conduct an on-site survey in Xuchang. Engineers found that the unit primarily handles domestic sewage (containing minor grease and solid debris), not industrial wastewater—leading them to recommend a 'grating + vacuum pump' configuration to avoid over-specification. Meanwhile, Zhang Yue compiled multiple reference case studies: - Sichuan Municipal Authorities procured four high-pressure cleaning & vacuum suction trucks (model CLW5120GQWD6) for similar applications, with users reporting 'approximately 30% improvement in treatment efficiency'; - Henan Sanitation Bureau procured ten 5-cubic-meter water sprinkler trucks, also built on Dongfeng chassis—the local service center noted 'fast direct shipment of spare parts'. Ultimately, Chengli submitted a detailed 'Technical Proposal for Xuchang National VI Dongfeng 3308 mm Wheelbase Sewage Treatment Vehicle', including: 1. Chassis specifications (Dongfeng 3308 mm wheelbase, China VI diesel engine, rated power approx. 95 kW); 2. Upfit configuration (stainless steel tank, capacity approx. 3.5 m³, equipped with 80-meter suction hose); 3. Budget estimate: Unit price approx. RMB 353,000–386,000 (tax-inclusive landed cost, based on publicly available tender data); 4. Delivery timeline: 7–15 days for standard models; urgent orders compressible to 10 days. Delivery and Trial Operation: From Contract Signing to Real-World Deployment