Case Study and Solution Analysis: Dongfeng D6 Blue License Plate, 3-cubic-meter Sludge Tipper Truck Procured by a Municipal Sanitation Department in Dongguan — Q2 2025 In the second quarter of 2025, a district-level municipal sanitation department in Dongguan City, Guangdong Province (hereinafter referred to as the 'procuring party') launched a procurement initiative for small-capacity sludge tipper trucks to address sludge removal and transportation needs arising from aging underground pipeline networks in its jurisdiction. Considering Dongguan’s location in the Pearl River Delta—characterized by hot, humid weather and prolonged rainy seasons—and the high frequency and heavy load demands of sludge transport operations, the procuring party imposed stringent requirements on vehicle corrosion resistance, sealing component durability, and all-weather operational capability. After preliminary market research and multiple internal evaluation rounds, the procuring party selected the Dongfeng D6 chassis-based, blue license plate, 3-cubic-meter sludge tipper truck manufactured by Chengli Special Purpose Vehicle Co., Ltd. (model number: CLW5030ZWXD6). This article comprehensively reconstructs the entire procurement process—from initial requirement identification and supplier selection to contract signing, delivery, and post-delivery user feedback—and includes a Frequently Asked Questions (FAQ) section for reference. I. Requirement Initiation by Department Leadership: The 'Three Highs' Challenge in a Humid-Tropical Environment In March 2025, the leadership of the procuring party raised the following concern during a monthly work meeting: 'Dongguan experiences its rainy season from April through September, during which sludge transport vehicles operate nearly every day. Our current fleet suffers severe rusting and cracked sealing strips, significantly impairing operational efficiency. The new batch of vehicles must meet three critical criteria: (1) comprehensive anti-corrosion coating across the entire vehicle—especially on the chassis and tank body; (2) sealing components that resist aging and leakage under high-load conditions during the rainy season; and (3) compliance with blue license plate regulations, allowing operation with a Class C driver’s license to facilitate access to narrow alleys and back streets.' Per local procurement practice, the budget was capped at approximately RMB 125,000–130,000 per unit, with an initial order quantity of six units. This requirement was promptly incorporated into the department’s annual special procurement plan. II. Internal Supplier Selection Process: Comparative Evaluation of Three Suppliers — Chengli’s Proposal Emerges as the Top Choice The procuring party convened a selection meeting involving its Technical Division, Equipment Division, and frontline team leaders, shortlisting three suppliers: Chengli Special Purpose Vehicle Co., Ltd., a leading East China-based brand, and a Guangdong-based local upfitter. Key comparison criteria included the following four dimensions: | Evaluation Criteria | Chengli Dongfeng D6 Blue License Plate, 3-cubic-meter Sludge Tipper Truck | East China Brand Equivalent Model | Guangdong Local Upfitter Model | |---------------------|--------------------------------------------------------------------------|--------------------------------------|------------------------------| | Chassis Brand & Model (Reference Announcement) | Dongfeng D6 (complete official announcement CLW5030ZWXD6) | Light-duty truck chassis—not original Dongfeng factory-built | Dongfeng mini-truck chassis—not officially announced | | Tank Anti-Corrosion Process | Sandblasting + epoxy primer + acrylic polyurethane topcoat; salt-spray resistance ≥500 hours (data provided by manufacturer) | Standard paint finish—no specialized anti-corrosion treatment | Rust-inhibiting primer only—no third-party test report | | Sealing Component Material | Acid- and alkali-resistant rubber sealing strips; temp