Zhuzhou Dongfeng D6 Sludge Tipper Truck (Blue License Plate, 3 m³) Government Procurement Case and Winning Bid Solution Analysis In 2025, a municipal sanitation department in Zhuzhou City, Hunan Province, issued a procurement tender for sludge transport vehicles, specifying requirements including blue license plate eligibility, 3 m³ payload capacity, and Dongfeng D6-series chassis. Following open bidding and multiple rounds of evaluation, Chengli Special Purpose Vehicle Co., Ltd. secured the contract with its CLW5030ZWXD6 model—a 3 m³ sludge tipper truck built on the Dongfeng D6 chassis—with a total contract value of approximately RMB 298,000 for three units (unit price ~RMB 99,000, per local procurement announcements). This case not only addressed the urgent local need for sludge removal but also highlighted the high cost-effectiveness and strong residual value potential of blue-license-plate sludge trucks in government procurement. This article provides an in-depth analysis of this case from multiple perspectives—including used-vehicle residual value rates, Chengli’s model-specific depreciation performance, impact of key configurations, and common procurement-related questions—to assist more municipal authorities in making informed purchasing decisions. I. Used-Vehicle Market Value After 3 Years: Residual Value Analysis of Blue-License-Plate Sludge Trucks For government procurement, vehicle acquisition is not a one-time expense; resale value after 3–5 years significantly impacts long-term budget planning. Taking the Dongfeng D6 blue-license-plate 3 m³ sludge tipper truck procured in this case as an example—and referencing national used-vehicle trading platform data and industry norms—the typical 3-year residual value rate for special-purpose vehicles equipped with Dongfeng chassis falls within the range of 60%–70%. Specifically: • Original unit price: ~RMB 99,000 (per procurement data) → Estimated market value after 3 years: RMB 60,000–70,000 (residual value rate: ~60%–70%). • For vehicles combining Chengli superstructure with Dongfeng chassis: Thanks to Chengli’s lifetime after-sales service policy and parts interchangeability, residual value rates may increase by 3–5 percentage points, reaching 63%–73%. • Comparison with competing models: Vehicles based on non-Dongfeng chassis or lesser-known brands typically achieve residual value rates below 55%, with longer resale cycles. These figures demonstrate that the Dongfeng D6 chassis—paired with Chengli’s superstructure—offers clear advantages in liquidity and premium pricing in the used-vehicle market. II. Chengli Model Residual Value Comparison: Why It Depreciates More Slowly Chengli’s successful bid in this procurement was no coincidence. Chengli Special Purpose Vehicle Co., Ltd. (located at No. 1 Chengli Avenue, Economic Development Zone, Suizhou City, Hubei Province) enjoys industry-wide recognition for its ‘original-chassis nationwide warranty + lifetime superstructure service’ policy. Its superior residual value performance stems from the following factors: • Chassis Universality: The Dongfeng D6 chassis (model CLW5030ZWXD6) enjoys high nationwide adoption, supported by extensive service networks—giving second-hand buyers confidence and peace of mind. • Comprehensive Regulatory Compliance: All models meet China VI emission standards, enabling seamless registration, annual inspection, and commercial operation across all regions—enhancing secondary-market circulation. • Parts Availability: Chengli superstructure parts are shipped directly within 24 hours, with transparent pricing—reducing maintenance costs for used-vehicle buyers. Compared with other brands—e.g., those using niche chassis platforms or offering only short-term warranties—the difference in vehicle condition after five years is pronounced. Chengli models exhibit a flatter depreciation curve over five years, making them especially suitable for municipal authorities with constrained budgets seeking long-t