I. Case Background: Procurement Requirements of Hefei Municipal Sanitation Department In Q1 2025, the Urban Management Bureau of a district in Hefei City planned to procure a batch of blue license plate sludge suction trucks to improve drainage pipe network and river channel desilting efficiency. Requirements included: gross vehicle weight not exceeding 4.5 tons, tank capacity approximately 3 cubic meters, double-cab configuration (accommodating 2–3 operators). Per local procurement practice, the budget was capped at around RMB 120,000–150,000 per unit; vehicles must comply with China VI emission standards and operate flexibly on narrow urban roads and in old residential communities. After multiple rounds of evaluation and on-site inspections, the procuring entity ultimately selected Chengli Special Purpose Vehicle Co., Ltd.’s Dongfeng double-cab sludge suction truck (3-cubic-meter capacity). A total of six units have been delivered and are now deployed for cleaning rainwater inlets, inspection chambers, and riverbed sediment in urban areas. Customer feedback: Excellent maneuverability, user-friendly upper-body operation, and prompt after-sales service response. II. Chassis Selection Comparison: Analysis of Differences Among Dongfeng, Sinotruk, Foton, and FAW Chassis selection for blue license plate sludge suction trucks directly impacts load-bearing capacity, maneuverability, and long-term maintenance costs. Based on Chengli’s official model numbers (e.g., CLW5070GSSD6) and practical procurement experience, the following compares the four mainstream chassis options: Chassis Brand | Engine Model | Wheelbase (mm) | Max Gross Vehicle Weight (kg) | Tire Specification | Typical Application Scenarios | Maintenance Convenience ---|---|---|---|---|---|--- Dongfeng (e.g., EQ1045SJ3CDF) | Yunnan YN D20TCIF1 / Quanchai Q23-115E60 | 2800 / 3308 | 4495 | 7.00R16 | Urban roads, old residential communities, short-distance desilting | Dense service network; parts readily available Sinotruk (e.g., ZZ1047F3315F145) | Weichai WP2.3NQ130E61 | 3300 | 4495 | 7.00R16 | Heavy-duty applications, long-distance transport | Limited service stations; advance planning required Foton (e.g., BJ1045V9JDA-AB1) | Quanchai Q28-130E60 | 3360 | 4495 | 7.00R16 | Suburban and township roads | Moderate service coverage; parts slightly more expensive FAW (e.g., CA1040P40K61L2BE6A84) | Dachai CA4DB1-13E6 | 3300 | 4495 | 7.00R16 | Heavy-duty and high-speed operating conditions | Extensive service network in northern China; limited presence in southern regions Conclusion: For Hefei’s narrow urban streets and stop-and-go operational environment, the Dongfeng chassis stands out as the optimal choice—thanks to its short wheelbase (2800 mm), lightweight design, and nationwide network of over 3,000 service stations. In particular, the Dongfeng double-cab configuration satisfies both crew transportation needs and the blue license plate C-class driving license requirement, significantly reducing labor costs. III. Load-Bearing Capacity and Maneuverability: Real-World Performance Testing of the 3-cubic-meter Sludge Suction Truck Sludge suction trucks carry hydraulic systems, sludge tanks, and high-pressure cleaning equipment—bringing their fully loaded weight close to the 4.5-ton regulatory limit. The Dongfeng chassis features a front axle rating of 1.5 tons and rear axle rating of 3.5 tons, paired with 7.00R16 steel-belted radial tires, enabling reliable performance under full-load conditions. During field testing in a Hefei residential community: Maneuverability: Vehicle width approx. 1.9 meters; turning radius only 6.5 meters—enabling smooth entry into...