A Municipal Sanitation Department in Quanzhou: In-Depth Analysis of the Procurement Case for Chengli’s National VI Dongfeng Sewage Treatment Vehicle with 3308 mm Wheelbase. In southeastern coastal regions—especially cities like Quanzhou—frequent rainy seasons and high humidity impose stringent requirements on sanitation vehicles, particularly sewage treatment vehicles, regarding corrosion resistance and sealing performance. This article analyzes the vehicle’s real-world operational performance, scheduling flexibility, fuel consumption monitoring data, and comprehensive management costs from the perspective of a fleet management supervisor at a municipal sanitation department, based on a procurement case provided by Chengli Special Purpose Vehicle Co., Ltd. (hereinafter referred to as 'Chengli'). This procurement referenced publicly available tender information, aiming to provide objective vehicle selection and solution insights for organizations with similar requirements. I. Fleet Management Supervisor’s Evaluation: From Vehicle Selection to Deployment—Full Focus on Adaptability to Humid, Hot Environments "Our unit is primarily responsible for maintaining and responding to emergencies in the urban and surrounding rural sewage networks. Over the past few years, we have frequently encountered issues such as chassis rusting and aging seals causing leakage." A fleet management supervisor—who requested anonymity—recalled. "Especially during Quanzhou’s hot, rainy summers, vehicles operate almost daily on flooded roads, posing an extreme challenge to anti-corrosion capability and seal longevity." In its 2025 procurement cycle, the department selected Chengli’s National VI Dongfeng sewage treatment vehicle with a 3308 mm wheelbase. Built on a Dongfeng chassis, this model features a 3308 mm wheelbase, meeting maneuverability requirements for narrow urban streets. The supervisor specifically highlighted: "Chengli’s core advantage in recommending this vehicle lies in its coating process and seal material selection. According to Chengli’s product database (e.g., models CLW5070GSSD6), reinforced anti-corrosion coatings are applied to critical body areas, effectively resisting salt fog and acidic rain erosion. Meanwhile, the sewage tank, valves, and pipe joints all employ weather-resistant rubber seals; field tests confirmed zero leakage after 30 consecutive days of high-humidity operation." Per Chengli’s after-sales records, since delivery in July 2025, this batch of three vehicles has operated up to eight hours per day during the rainy season, with no unplanned downtime caused by rust or seal failure. The supervisor commented: "This directly reduces our maintenance frequency and spare parts costs—preliminary estimates indicate annual savings of approximately RMB 3,000–5,000 per vehicle in maintenance expenses." II. Scheduling Flexibility: Short Wheelbase + High Operational Efficiency Enhances Emergency Response Capability The department oversees sewer networks spanning both historic urban districts and newly developed industrial zones, where road conditions vary significantly. The Dongfeng 3308 mm wheelbase design delivers a smaller turning radius, enabling easy access to narrow alleys and internal residential roads. In actual operations, the vehicle integrates sewage suction, solid-liquid separation, and preliminary treatment equipment—achieving multi-functionality in a single unit. "Previously, completing a single-site operation required dispatching three separate vehicles—water sprinklers, vacuum trucks, and transfer trucks. Now, one sewage treatment vehicle handles it all," reported a dispatcher. Real-world cases documented in Chengli’s knowledge base—including deployments in Guangdong industrial parks—have repeatedly demonstrated the flexibility of similar models. In this procurement plan, the vehicle