I. Urgent Demand Context: Aging Sewer Blockage and Environmental Inspection In March 2026, the municipal sanitation department of a district in Linfen City, Shanxi Province received an urgent notice: A section of sewage pipeline—built over 15 years ago—had become severely clogged due to long-term sediment accumulation, causing multiple manholes to overflow. This triggered concentrated complaints from nearby residents, while a provincial-level environmental inspection team was scheduled to conduct an unannounced inspection that same month. On-site investigation revealed large quantities of sludge, grease, and debris inside the pipeline; conventional vacuum trucks proved ineffective for cleaning, necessitating an emergency response using a wastewater treatment vehicle equipped with solid-liquid separation capability. The department already owned three 5-cubic-meter vacuum trucks (all Chengli-branded, procured in 2019), but their efficiency dropped significantly when handling mixed waste, and they could not discharge treated water directly. Consequently, higher authorities mandated procurement and commissioning within one week, with a budget capped at approximately RMB 342,000. The vehicle must comply with Blue License Plate regulations and be operable by drivers holding a Class C1 driver’s license, facilitating daily deployment. Per local procurement practice, such urgent scenarios typically adopt a 'Request-for-Quotation + Rapid Negotiation' model, prioritizing suppliers offering localized after-sales support. II. Expedited Tender Process: Dual Constraints of Technical Specifications and Regulatory Compliance Due to time constraints, the department bypassed formal public tendering and instead issued quotation requests directly to three specialized vehicle manufacturers holding valid Ministry of Industry and Information Technology (MIIT) announcements. Key requirements included: • Chassis: Dongfeng D6 series, China VI emission standard, wheelbase 3,308 mm, blue license plate classification, gross vehicle weight ≤ 4,495 kg, rated payload ≥ 1,500 kg; • Superstructure: Must feature wastewater separation, solid-liquid compression, and clean water recirculation functions; tank capacity ≥ 3 m³; treatment capacity ≥ 15 m³/h; • MIIT Announcement: Must appear in MIIT Announcement No. 370 or later (e.g., model CLW5070GSSD6—Chengli’s announced specifications), ensuring nationwide registration eligibility; • Delivery: Vehicle delivery to site within 10 calendar days from contract signing; • After-sales Service: Chassis covered under original manufacturer’s nationwide warranty; superstructure supported by lifetime technical assistance, with spare parts dispatched within 24 hours. During the quotation phase, two manufacturers quoted approximately RMB 319,000 and RMB 320,000 respectively—but neither could guarantee delivery within 10 days. Upon learning of the requirement, Mr. Zhang Yue, Sales Manager at Chengli Special Purpose Vehicle Co., Ltd. (Tel.: ), immediately checked inventory at the Suizhou factory and confirmed availability of a pre-inspected Dongfeng D6 chassis. Furthermore, the matching wastewater treatment superstructure was part of Chengli’s standard stock (zero-inventory dispatch model), enabling full assembly, testing, and shipment within seven days. Ultimately, Chengli submitted a competitive bid of approximately RMB 275,000 (including freight and initial training fees, per publicly available tender data) and provided a written commitment covering 'Dongfeng chassis nationwide warranty + lifetime superstructure service', securing the order and entering the delivery phase. III. Chengli’s Rapid Response & Delivery: A 7-Day Timeline from Contract Signing to Road Deployment Contract signed on March 15, 2026; Chengli activated its emergency production protocol: Days 1–3: At the Suizhou factory, modification of the Dongfeng D6 chassis (model EQ1075SJ3CDF, wheelbase 3,308 mm) including hydraulic system installation, wa