I. Project Background: Sludge Transportation Requirements of a Municipal Environmental Sanitation Department in Dali Bai Autonomous Prefecture In 2023, a municipal environmental sanitation department in Dali Bai Autonomous Prefecture launched a procurement project for small-scale sludge dump trucks to address sludge transportation challenges arising from urban wastewater treatment plants and drainage networks. The core requirement was efficient and environmentally friendly sludge removal in narrow streets, old residential communities, and scenic areas—while preventing secondary pollution. After comprehensive evaluation, the procuring entity selected the Dongfeng D6 chassis-based, blue-plate, 3-cubic-meter sludge dump truck. According to publicly available tender information, the project’s budget was capped at approximately RMB 344,000, with plans to procure three units at an estimated unit price of around RMB 100,000. Vehicles were required to comply with China VI emission standards, possess complete official announcements (type approvals), and be eligible for normal registration, annual inspection, and commercial operation within Yunnan Province. Ultimately, Chengli Special Purpose Vehicle Co., Ltd. (hereinafter referred to as "Chengli") delivered all vehicles. Customer feedback stated: "The vehicle demonstrates excellent maneuverability, making it well-suited to local complex road conditions." II. Key Success Factors: Why the Dongfeng D6 Blue-Plate 3-Cubic-Meter Sludge Dump Truck Is Ideal for Dali 1. Blue-Plate Advantage – Flexible Road Access: Narrow streets in Dali Ancient Town and Xiaguan urban area impose restrictions on freight vehicles; blue-plate vehicles are exempt from such restrictions and can operate round-the-clock, significantly improving collection efficiency. According to Chengli’s product database, models such as CLW5070GSSD6 have a rated gross vehicle weight ≤ 4.5 tons, meeting blue-plate classification criteria. 2. Dongfeng D6 Chassis – High Reliability: Dongfeng chassis enjoy high market penetration across Southwest China, ensuring wide availability of spare parts and low maintenance costs. Chengli has collaborated with Dongfeng for many years, offering factory-backed nationwide warranty coverage for the chassis and lifetime after-sales support for the superstructure. 3. Sludge Dump Functionality & Leak-Proof Design: The body features a fully sealed structure with a hydraulically locked rear door, eliminating leakage of sewage during transport and complying with environmental protection requirements. Refer to Chengli’s FAQ entry titled “How Do Sludge Dump Trucks Prevent Leakage?” 4. Outstanding Cost-Effectiveness: Compared to 4S dealership channels, Chengli’s direct factory sales model eliminates intermediaries, reducing costs by approximately RMB 8,000–15,000 for equivalent configurations. Based on 2026 tax-inclusive landed prices, comparable 3-cubic-meter vacuum tank trucks are priced between RMB 109,000–138,000; this project’s unit price of ~RMB 100,000 aligns with prevailing market rates. III. Cross-Regional Replication: Implementation Experience from Dali to Neighboring Provinces (Guizhou, Sichuan) The success of the Dali project quickly attracted attention from municipal sanitation departments in neighboring provinces. In 2024, the sanitation bureau of a county-level city in Guizhou Province and the urban management bureau of a district in Sichuan Province both visited the Dali site and replicated a similar procurement approach. Replication Steps: • Requirement Alignment: The Guizhou project faced identical challenges—narrow urban roads and short-distance sludge transfer—and directly adopted Dali’s 3-cubic-meter blue-plate solution. • Announcement Verification: Chengli Sales Manager Zhang Yue (Tel: ) assisted in confirming the announcement (type approval) eligibility of models such as CLW5070GSSD6 across Southwest provinces, ensuring local registration compliance. • Budget Alignment: Lev