Case Background: Sludge Transportation Pain Points of a Municipal Sanitation Department in Chongqing. Located in Southwest China, Chongqing experiences a hot, humid climate with frequent rainy seasons, posing significant challenges for municipal sludge transportation. A municipal sanitation department (hereinafter referred to as 'the client') previously relied on an aging fleet of tipper trucks with small cargo capacities (mostly 12–18 m³) and lacked specialized protective design for sludge characteristics. Under high-temperature, high-humidity conditions, severe corrosion of truck bodies and frequent failure of sealing components led to leakage and odor dispersion during transport—reducing operational efficiency and triggering repeated environmental complaints. The client handles approximately 30,000 tons of sludge annually; its original fleet achieved only about 120 tons per day and required three rotating shifts of drivers, resulting in persistently high operating costs. To meet growing sludge disposal demands and improve operational efficiency, the client launched a new procurement initiative for sludge transport vehicles in 2024, ultimately selecting Chengli Special Purpose Vehicle Co., Ltd.’s 24-m³ Sinotruk-based sludge tipper truck. This article analyzes post-deployment improvements in efficiency and cost optimization based on publicly available tender information and actual operational data. Selection Solution: 24-m³ Sinotruk-Based Sludge Tipper Truck. According to tender documents and configuration parameters provided by Chengli (reference model: CLW5250ZWXZ6, modified on Sinotruk chassis), key features of this vehicle include: Chassis: Sinotruk HOWO series, compliant with China VI emission standards, robust powertrain optimized for Chongqing’s complex road conditions. Body: 24-m³ large-capacity cargo box fabricated from high-strength steel, internally coated with anti-corrosion and rust-resistant paint specifically engineered for corrosive media such as sludge. Sealing System: Moisture- and heat-resistant rubber sealing strips; tested to deliver over 30% longer service life than standard products under 85% relative humidity, effectively preventing leakage. Tipping System: Hydraulic top-lift mechanism enabling rapid unloading in less than 30 seconds. Regulatory Compliance: Fully China VI-certified, eligible for nationwide registration and annual inspection, meeting government procurement compliance requirements. Consistent with local procurement practices, the project budget was capped at approximately RMB 273,000 per unit; the final winning bid price was approximately RMB 238,000 per unit (per publicly disclosed tender data), with a total order of eight units amounting to roughly RMB 1.9 million. Pre- and Post-Deployment Performance Comparison. Below is a comparative analysis of operational metrics before and after deployment of the eight 24-m³ sludge trucks (data sourced from the client’s internal operation reports and post-tender performance evaluation reports): Metric — Pre-deployment (Aging Fleet) — Post-deployment (Eight 24-m³ Trucks) — Improvement Rate. Daily Operational Volume (tons): 120 — 192 — +60%. Daily Trips per Vehicle: 3–4 — 4–5 — +25%. Average Time per Trip (hours): 1.5–2 — 1–1.2 — Reduced by 33%. Driver Staffing (number of personnel): 24 (three-shift rotation) — 16 (two-shift rotation) — Reduced by 33%. Average Monthly Maintenance Cost per Vehicle (RMB): ~3,500 — ~1,200 — Reduced by 66%. Monthly Sludge Leakage Complaints (incidents): 3–5 — 0–1 — Significant improvement. As shown in the data, daily operational volume increased from 120 tons to 192 tons—a 60% gain—primarily attributable to the increase in per-vehicle capacity from 12–