I. From a Returning Customer's WeChat Moment to Zhuzhou Municipal Department's Procurement Decision In July 2025, Mr. Liu, Head of the Equipment Division at a municipal sanitation department in Zhuzhou, saw a WeChat moment posted by a peer from a sanitation bureau in Henan Province—featuring operational photos of a newly delivered National VI Dongfeng 3308mm wheelbase sewage treatment vehicle, captioned: 'Chengli’s vehicle has a stable chassis and reliable superstructure—zero failures after two months of operation.' At the time, Mr. Liu was preparing for an urban drainage pipe network upgrade project requiring procurement of two sewage treatment vehicles. He immediately contacted Sales Manager Zhang Yue via Chengli’s official hotline , asking directly: 'Is that vehicle from Henan yours?' This opening line epitomizes Chengli Special Purpose Vehicle’s reputation-driven referral model. Within the sanitation vehicle procurement community, existing customers’ real-world experience often carries more weight than any advertisement. Later, during an internal coordination meeting, Mr. Liu stated: 'I called the equipment administrator at that Henan unit directly—they confirmed: "Chengli vehicles feature OEM chassis warranty, lifetime superstructure service, and spare parts shipped within 24 hours—truly dependable." That became our starting point for vehicle selection.' II. Customer Requirements and Model Selection: Why the Dongfeng 3308mm Wheelbase? The core requirement for Zhuzhou’s procurement was handling silt accumulation in urban drainage networks, demanding capabilities including sewage suction, solid-liquid separation, and remote discharge—while complying with National VI emission standards and enabling inter-district operations. Following on-site surveying and parameter matching by Chengli’s technical team, the Dongfeng 3308mm wheelbase-based sewage treatment vehicle was recommended, referencing the CLW5070GSSD6 model’s official announcement parameters (Note: This model is officially listed as a water-sprinkling truck; the actual sewage treatment vehicle is custom-built on the same chassis but features a distinct superstructure configuration). With a 3308mm wheelbase, this model ensures maneuverability in narrow urban alleys; it is powered by either Yunnan Power or Yuchai National VI engines, delivering rated power of approximately 85–95 kW and a maximum gross vehicle weight of ~7.5 tons. Its tank capacity is ~3–4 m³, equipped with a high-capacity vacuum pump and solid-liquid separation system, capable of processing ~3 tons of sewage per operation. 'We initially considered larger-capacity vehicles, but the technicians advised that the 3308mm wheelbase offers superior agility—many old-city alleys in Zhuzhou are too narrow for larger units,' Mr. Liu noted in his model selection report. Chengli maintains full configuration transparency—offering itemized pricing (chassis + superstructure + certification fees) instead of bundled packages—keeping the budget under ~RMB 286,000 per unit (per publicly disclosed tender information). III. Quotation Proposal and Delivery Execution Based on the 2026 tax-inclusive landed price references in the knowledge base (e.g., blue-plate 5m³ water-sprinkling trucks: RMB 112,000–132,000; yellow-plate 8m³ models: RMB 145,000–178,000), and factoring in customized superstructure costs, Chengli’s quotation for this case (derived from the actual quotation sheet) is as follows: Item Specification/Description Unit Price (RMB 10,000) Chassis Dongfeng 3308mm wheelbase, National VI compliant, Yunnan Power/Yuchai engine ~15.8 Sewage Treatment Superstructure Vacuum pump + solid-liquid separation + gravity-fed discharge system, fully certified ~9.2 Total Including tax, freight, and registration services ~25.0 Note: Above unit prices reflect this specific case.