Guangzhou Government Procurement Case of Foton Fengjing Service Vehicles: A Full-Process Analysis from Single-Unit Trial to Batch Procurement. In the humid and hot climate of South China, municipal sanitation departments’ operation vehicles frequently face severe challenges including high temperature, high humidity, and heavy rainfall. In 2025, the Urban Management Bureau of a district in Guangzhou procured a batch of Foton Fengjing service vehicles for daily inspection, emergency response, and equipment transportation. This article uses this case as a reference to comprehensively analyze the decision-making process—from initial single-unit trial to subsequent batch procurement—with particular focus on anti-corrosion coating performance, sealing component durability, and high-load operational reliability during the rainy season. I. Case Background: Procurement Requirements under Humid-Hot Conditions Guangzhou lies in a subtropical monsoon climate zone, with an annual average relative humidity exceeding 80% and a rainy season lasting six months. The municipal sanitation department in this region previously experienced frequent maintenance issues due to severe rusting and aging of sealing components on its existing fleet—significantly impacting operational efficiency. At the end of 2024, the department planned to replace five service vehicles, with a budget capped at approximately RMB 338,000 (based on publicly available tender information). After comprehensive evaluation, it adopted a ‘trial-first’ strategy: requesting one prototype vehicle from the supplier for field testing to verify environmental adaptability before proceeding with bulk procurement. II. Single-Unit Trial: Performance Monitoring and Key Metrics In January 2025, the department conducted a trial of one Foton Fengjing service vehicle supplied by Chengli Special Purpose Vehicle Co., Ltd. (Address: No. 1 Chengli Avenue, Economic Development Zone, Suizhou City, Hubei Province). The vehicle features a Foton chassis and is equipped with a China VI-compliant engine, meeting Guangzhou’s environmental regulations. Below are key observations recorded during the four-month trial period (January–April): 1. Anti-Corrosion Coating Performance Due to high atmospheric salt content—especially near coastal areas—vehicle chassis and sheet metal parts in Guangzhou are highly susceptible to corrosion. This vehicle employs galvanized steel panels combined with epoxy primer coating; critical weld joints are additionally sealed with anti-rust sealant. During the trial, the vehicle traveled approximately 50 km daily on damp roads and underwent high-pressure water cleaning once per week. After four months, inspections revealed no rust spots on the chassis and no paint blistering along door edges—outperforming competing models previously used (which exhibited minor rusting after only three months). 2. Sealing Component Durability under Humid-Hot Conditions Sealing components—including door, window, and cargo compartment seals—are prone to aging under high temperature and humidity. This vehicle utilizes EPDM rubber sealing strips, which passed a 72-hour humid-heat aging test (50°C, 95% RH). During the trial, Guangzhou experienced multiple heavy rainstorms (daily rainfall exceeding 100 mm), yet no water infiltration occurred inside the cabin, and no cracking or tackiness was observed on the sealing strips. In contrast, another brand showed compromised door sealing and leakage after just one month of trial use—demonstrating Foton Fengjing’s superior performance. 3. High-Load Operational Performance during the Rainy Season During Guangzhou’s rainy season (April–September), operational frequency increases significantly, requiring frequent start-stop cycles and driving through flooded sections. Equipped with a Foton engine delivering maximum power of 88 kW and paired with a 5-speed manual transmission, the vehicle successfully traversed road sections with standing water up to 30 cm deep o