I. Addressing Real-World Challenges: Pain Points of Rainy-Season Operations in Liuzhou City In spring 2025, a municipal sanitation department in Liuzhou City faced a persistent yet challenging issue—the clearing of urban drainage system blockages during prolonged heavy-rain seasons. Previously, they relied on conventional vacuum trucks and manual cleaning, which proved inefficient, hazardous to workers’ health, and unsustainable under the high-frequency, high-load operational demands of the rainy season. After multiple rounds of evaluation, the department decided to procure a batch of Chengli Dongfeng Yizhan-style sewage treatment vehicles to meet the urgent, high-intensity emergency response requirements during the rainy season. These vehicles began delivery in June 2025 and have been in operation for over eight months. II. Driver’s Perspective: From 'Reluctant to Drive' to 'Enthusiastic to Operate' We interviewed Master Li, the driver responsible for daily operations of these vehicles. With nearly 15 years of experience operating special-purpose vehicles in the municipal sanitation system, he candidly shared: 'When I first heard I’d be driving this vehicle, I was hesitant—after all, traditional vacuum trucks are noisy, emit strong odors, and leave drivers physically exhausted after just one day’s work. But this Yizhan model is completely different.' 1. Operational Convenience: Intelligence Makes Operation 'User-Friendly' Master Li particularly emphasized the vehicle’s fully hydraulic control system. 'In the past, operating vacuum trucks required manually operating valves and constantly monitoring gauges—mistakes like over-suction or overflow were common. Now, with this vehicle, liquid level and pressure are displayed directly on the in-cab touchscreen; startup is one-touch, and operations are fully automated. Even as a 50-plus-year-old driver, I was able to operate it independently after just one morning of training.' This intelligent design significantly improves operational efficiency—especially critical during the rainy season when rapid response is essential. 2. Ease of Operation for C-Class License Holders: Blue-Plate Advantage Enables Novice Drivers The sewage treatment vehicles procured in this batch are blue-plate models (e.g., CLW5070GSSD6), with a gross vehicle weight rating (GVWR) not exceeding 4.5 tons—making them legally drivable with a standard C1 driver’s license. Master Li noted: 'Our team’s newest recruit—a young driver who obtained his license less than a year ago—drives this vehicle without difficulty. Steering is highly responsive, visibility is excellent, and both rear-view camera and parking radar systems are equipped. It’s even easier to drive than his personal SUV.' This substantially lowers recruitment barriers for qualified drivers and reduces labor costs. 3. Rust Resistance and Seal Performance in Humid-Heat Conditions: A 'Must-Have' for Southern Operations Located in South China, Liuzhou experiences high summer temperatures and humidity, along with an extended rainy season. Under such conditions, chassis and upper-body components of special-purpose vehicles are especially prone to rust and seal degradation. Master Li observed this most acutely: 'With previous vehicles, paint chipping and rust would appear on the frame within two or three years, and hydraulic cylinders often leaked oil. This Chengli vehicle received full-chassis anti-corrosion coating prior to factory delivery—especially thick coverage at welds and joints. Even after eight months, the undercarriage looks brand-new after washing.' Moreover, Chengli selected weather-resistant sealing materials (e.g., imported polyurethane) specifically for humid-heat environments. According to Master Li: 'We operate daily throughout the rainy season—no leakage incidents have occurred; sealing performance has been outstanding.' III. On-Site Operational Record: Real-World Performance Under High-Rainy-Season Load In July 2025, Liuzhou City experien