I. Case Background: Procurement of New Generation V348 Service Vehicles by a District Urban Management Bureau in Guangzhou In early 2025, a district urban management bureau in Guangzhou planned to procure a batch of light-duty service vehicles for daily municipal inspections, emergency repairs, and material transportation. After multiple rounds of technical evaluation and price negotiations, Chengli Special Purpose Vehicle Co., Ltd.’s modified Ford New Generation V348 service vehicles were selected, with six units delivered at an approximate unit price of RMB 340,000 (based on publicly available tender information). These vehicles have been in operation for nearly one year, and customer feedback highlights “low failure rate, excellent sealing performance, and stable operation during the rainy season.” This case is not isolated. According to statistics from Chengli’s Suizhou production base, over the past three years, more than 30 Ford New Generation V348 service vehicles have been delivered across Guangdong Province, covering cities including Guangzhou, Shenzhen, Dongguan, and Foshan; approximately 60% of these orders originated from repeat customers or referrals from industry peers. II. Why the Ford New Generation V348? Chassis Advantages and Customization Requirements The Ford New Generation V348 chassis (Jiangling Ford Transit series) is a classic model in China’s light commercial vehicle market, offering the following core advantages: Powertrain: Equipped with a 2.2T diesel engine delivering a maximum power output of 103 kW and peak torque of 355 N·m, paired with a 6-speed manual transmission; average fuel consumption is approximately 8.5 L/100 km. Chassis Load Capacity: Features front MacPherson independent suspension and rear leaf-spring non-independent suspension; rated payload capacity is 1.5 tons—ideal for mounting various equipment. Interior Space Layout: The long-wheelbase variant offers an interior length of approximately 3.5 meters and height of 1.8 meters, suitable for customization into mobile offices, emergency repair units, or material transport vehicles. In government procurement, the V348 chassis is widely favored by municipal authorities nationwide due to its complete regulatory approvals and seamless registration, annual inspection, and commercial operation eligibility (Catalogue No. 108, Ministry of Industry and Information Technology). However, the quality of the body-upfit directly impacts vehicle service life and operational efficiency—especially critical in Guangzhou’s high-temperature, high-humidity climate with frequent heavy rainfall. III. Chengli’s Core Competitive Edge in Body-Upfit: Corrosion Resistance and Sealing Performance Guangzhou features a typical subtropical maritime monsoon climate, with an annual average relative humidity exceeding 80% and concentrated rainfall from April to September—often exceeding 50 mm per day. Under such conditions, corrosion resistance coatings and sealant durability become key evaluation criteria for service vehicles. 1. Corrosion-Resistant Coating: Full-Body Electrophoretic Coating + Underbody Armor During V348 service vehicle upfitting, Chengli applies secondary reinforcement treatments to both the original chassis and interior cargo compartment: Chassis Corrosion Protection: Full-body electrophoretic coating ensures uniform anti-corrosion coverage—even on concealed metal components—followed by three layers of underbody armor (approx. 2 mm thickness), effectively isolating salt fog and moisture intrusion. Cargo Compartment Anti-Corrosion: Interior floor and side walls are fabricated from 304 stainless steel plates (1.5 mm thick); joints are sealed using dual-layer protection—silicone sealant plus rubber gaskets—to prevent rainwater infiltration and subsequent rust formation. According to feedback from the Guangzhou district urban management bureau: “These Chengli-modified vehicles successfully endured two typhoon-related torrential rain events last year, wi