I. Case Background and Procurement Requirements In Q1 2026, a municipal sanitation department in Ganzhou issued a public tender to procure one sewage treatment vehicle compliant with China VI emission standards for routine pipeline desilting, sewage suction, and transfer operations. Per local procurement practice, the budget was capped at approximately RMB 391,000, requiring a chassis wheelbase suitable for narrow streets, high-efficiency suction and separation capability, and full compliance with China VI environmental standards. After multiple rounds of technical evaluation and commercial negotiation, Chengli Special Purpose Vehicle Co., Ltd. delivered a sewage treatment vehicle built on the Dongfeng 3308-mm wheelbase chassis. The vehicle utilizes the CLW5070GSSD6 chassis model (referencing MIIT announcement parameters), demonstrating stable performance under heavy-load conditions. Customer feedback indicates an average daily operational duration of 8–10 hours, with significantly improved equipment fatigue management. II. Solution Overview: Heavy-Duty Operational Design and Equipment Fatigue Management High-intensity daily usage is standard for sanitation units—especially in Ganzhou’s rainy and humid climate, where sewage treatment vehicles frequently perform suction and transfer tasks. Chengli Special Purpose Vehicle prioritized three key design enhancements in this solution: • Chassis Load-Bearing Optimization: The Dongfeng 3308-mm wheelbase chassis underwent structural reinforcement, increasing rear axle load capacity to 4.5 tons; combined with a high-strength subframe, it ensures driving stability under full-load conditions. • Hydraulic System Durability: A dual-pump hydraulic system with an independent cooling circuit was adopted. Field testing shows hydraulic oil temperature rise remains within 45°C after 8 consecutive hours of operation, minimizing thermal degradation. • Tank Corrosion Resistance: The entire tank features a 304 stainless steel inner liner, with welded joints subjected to passivation treatment—extending corrosion resistance life to over eight years and reducing maintenance frequency. These design improvements directly address equipment fatigue management requirements: by lowering failure rates of critical components, customers avoid frequent downtime for repairs, increasing average daily effective operating time by approximately 20%. III. Cost Analysis and Comparison Based on publicly released tender information and Chengli’s factory-direct sales policy, the ex-factory price of this China VI-compliant Dongfeng 3308-mm wheelbase sewage treatment vehicle is approximately RMB 319,000, with an all-inclusive landed price (including tax, registration, first-year insurance, and training services) of about RMB 358,000. Compared to equivalent configurations offered through authorized 4S dealerships (typically priced between RMB 403,000–425,000), Chengli’s factory-direct model delivers savings of approximately RMB 8,000–15,000. Below is a comparative procurement cost table for similar models in the Ganzhou region (based on publicly available tender data): | Item | Chengli Factory-Direct Solution | 4S Channel Solution | |------|----------------------------------|------------------------| | Chassis Model | Dongfeng 3308-mm wheelbase (CLW5070GSSD6) | Dongfeng 3308-mm wheelbase (same model from competitor) | | Tank Capacity | 5 m³ | 5 m³ | | Ex-Factory Price | ~RMB 285,000 | ~RMB 360,000 | | All-Inclusive Landed Price | ~RMB 320,000 | ~RMB 380,000 | | Delivery Lead Time | 7–15 days (locally manufactured in Suizhou) | 30–45 days (subject to production scheduling) | | After-Sales Service | Nationwide chassis warranty; lifetime upfit warranty | Chassis warranty via 4S network; upfit warranty under separate contract | Note: All prices above are reference figures for Q2 2026; actual contract terms apply. IV. Delivery and User Feedback Chengli Special Purpose Vehicle completed full-vehicle manufacturing and commissio