Case study of the Dongfeng dual-cab sludge suction truck (blue license plate, 3 m³ capacity) in government procurement in Xinxiang City: A true record from initial trial to expanded contract renewal. Within the annual procurement plan of a municipal sanitation department in Xinxiang City, sludge suction trucks—critical equipment for addressing urban drainage blockages, riverbed dredging, and emergency rescue operations—have consistently ranked as top budget priorities. In 2022, the department conducted its first public tender, procuring two units of the Dongfeng dual-cab sludge suction truck (blue license plate, 3 m³ capacity), delivered by Chengli Special Purpose Vehicle Co., Ltd. After nearly two years of real-world operation, these vehicles demonstrated outstanding performance in maintenance cost efficiency, operational productivity, and regulatory compliance, prompting the department to expand its order to four units upon contract renewal in 2024—and to introduce new services including installment payment and trade-in programs. This article analyzes the core advantages and solution framework of the Dongfeng dual-cab sludge suction truck (blue license plate, 3 m³ capacity) in government procurement, based on this real-world case. I. Case Background: Initial Procurement in 2022 and User Feedback In 2022, a municipal sanitation department in Xinxiang faced increasingly frequent blockages in aging drainage networks and heightened flood risks during the rainy season, creating an urgent need for sludge suction trucks. Given budget constraints (per publicly available tender documents, the budget cap was approximately RMB 342,000 per unit) and requirements for blue-license-plate eligibility (C-class driver’s license) and low operating costs, the department selected the Dongfeng dual-cab sludge suction truck (blue license plate, 3 m³ capacity). The chassis is based on the Dongfeng series, while the superstructure was custom-engineered by Chengli Special Purpose Vehicle Co., Ltd. According to official Chengli specifications (e.g., variants of model CLW5070GSSD6), this vehicle features: • Blue-license-plate advantage: Gross vehicle weight ≤ 4.5 tons—operable with a C-class driver’s license, eliminating the need for A/B-class licensed drivers and reducing labor costs. • 3-m³ tank capacity: Optimized for sludge removal in urban branch roads, residential neighborhoods, and narrow streets—capable of handling ~3 cubic meters of sludge per operation. • Dongfeng dual-cab cab: Accommodates up to five personnel, facilitating team-based operations and improving work efficiency. • China VI emission compliance: Meets national environmental standards and is eligible for registration nationwide. In July 2022, Chengli delivered two units. According to feedback from the department, these vehicles performed exceptionally well in subsequent operations: • Operational Efficiency: For sludge removal tasks in narrow alleys of Xinxiang’s historic urban district, the blue-license-plate vehicle’s superior maneuverability enabled each unit to handle an average of 6–8 sludge removal cycles per day—representing a ~30% efficiency gain over previously rented large-capacity sludge suction trucks (which required A-class drivers and incurred higher fuel consumption). • Maintenance Cost: Dongfeng chassis benefits from nationwide warranty coverage; Chengli superstructures offer lifetime service support. A routine maintenance service—including hydraulic oil and filter replacement—costs approximately RMB 1,500, representing a 40% saving compared to similar products (approx. RMB 2,500). • Regulatory Compliance: Blue-license-plate vehicles are exempt from purchase tax (per local policy) and undergo simplified annual inspection procedures—significantly lowering overall operating costs. "Our 2022 procurement was primarily intended for emergency response and pilot evaluation. We were pleasantly surprised by the actual performance—especially the blue-license-plate vehicle’s