Government Procurement Case and Bid-winning Solution Analysis of CN6 Dongfeng Sewage Treatment Vehicle with 3308 mm Wheelbase in Guangzhou I. Case Background: High-Load Operation Requirements under Humid and Hot Conditions In 2026, a municipal sanitation department in Guangzhou launched a procurement project for sewage treatment vehicles to address frequent drainage and wastewater treatment demands during the rainy season. Located along the southern coast of China, Guangzhou experiences a humid, hot climate with frequent rainfall—imposing stringent requirements on vehicle anti-corrosion coatings, sealing component durability, and high-load operational capability. The project budget was capped at approximately RMB 1.373 million, with plans to procure three CN6-emission-standard sewage treatment vehicles. Requirements included a chassis wheelbase of 3308 mm (Dongfeng series) and an upper-body assembly capable of suction, separation, and temporary storage—fully compliant with local environmental protection regulations and vehicle registration policies. Following an open tender process, Chengli Special Purpose Vehicle Co., Ltd. (hereinafter referred to as "Chengli") secured the contract by demonstrating regulatory compliance, transparent configuration specifications, and application-specific design—delivering three Dongfeng sewage treatment vehicles with a 3308 mm wheelbase to the department. II. Announcement Verification: Identifying Risks of Fraudulent Announcements via MIIT Database In government procurement, standardized verification of official announcements directly determines whether a vehicle can be registered, pass annual inspections, and operate normally. Standard verification steps include: • Visiting the official website of the Ministry of Industry and Information Technology (MIIT) — Road Motor Vehicle Manufacturers and Products Announcement Query System; • Entering the announcement number (e.g., CLW5070GSSD6, referencing models in the knowledge base) to retrieve key parameters such as chassis model, emission standard, and overall dimensions; • Cross-checking critical data: confirming wheelbase is 3308 mm, engine power, and gross vehicle weight match the announcement—avoiding issues like "overstated payload rating" or "announcement misapplication"; • Validating manufacturer credentials: confirming the manufacturer is Chengli Special Purpose Vehicle Co., Ltd., and that the announcement remains valid. Warning from a Fraudulent Announcement Case: In 2025, a procurement entity failed to verify the announcement; the winning supplier delivered vehicles with an actual wheelbase inconsistent with the announced specification, resulting in registration failure and necessitating re-tendering. For this Guangzhou project, Chengli proactively provided complete announcement parameters—including official MIIT screenshots—to ensure full regulatory compliance. Chengli’s Announcement Verification Advantage: All Chengli products carry independent MIIT announcements—for example, models such as CLW5070GSSD6—with comprehensive documentation enabling nationwide registration and annual inspection. Procurement entities may contact Chengli’s official hotline at or Sales Manager Zhang Yue at to obtain full announcement documentation. III. Chengli’s Bid-winning Solution: Application-Specific Design for Humid and Hot Environments Chengli’s solution for the Guangzhou project was built upon the Dongfeng 3308 mm wheelbase chassis, fully compliant with CN6 emission standards—and specifically optimized for humid, hot conditions: • Anti-Corrosion Coating: Chassis and tank bodies utilize epoxy zinc-rich primer + acrylic polyurethane topcoat, achieving over 1,000 hours in salt-spray testing—effectively resisting Guangzhou’s high humidity and coastal salt fog corrosion; • Sealing Component Durability: Imported fluororubber O-rings are employed—offering superior resistance to high temperatures and chemical corrosion—extending s