I. Case Background: A Real Procurement Journey—from Initial Purchase to Contract Renewal and Expansion In June 2022, the municipal sanitation department of a district in Hengyang City procured two Dongfeng single-cab chassis, blue license plate, 5-cubic-meter sewer cleaning trucks via public tender for urban stormwater and sewage pipeline cleaning operations. These vehicles were manufactured and delivered by Chengli Special Purpose Vehicle Co., Ltd., model CLW5070GSSD6 (China VI emission standard; chassis sourced directly from Dongfeng’s original factory). According to publicly available tender information, the initial procurement budget was capped at approximately RMB 342,000, with a winning bid price of about RMB 150,000 per unit. After nearly two years of practical operation, the customer reported that these vehicles achieved 'high operational availability, low failure rate, and sewer cleaning efficiency over three times higher than traditional manual methods.' In March 2024, the department initiated a follow-up procurement, expanding the order to five units and explicitly requiring identical chassis and body configurations as those used in the 2022 procurement—only upgrading certain hydraulic piping components. The total contract value for this renewal was approximately RMB 750,000 (per publicly available tender data), with unit pricing remaining essentially unchanged from the initial purchase—demonstrating the customer’s high level of confidence in Chengli’s products and services. II. Why Did the Customer Choose to Renew? Usage Satisfaction and Detailed Equipment Selection Analysis According to feedback from the customer, the two sewer cleaning trucks purchased in 2022 accumulated over 2,000 operating hours within two years and completed cleaning operations across approximately 80 kilometers of urban pipelines. Key advantages included: • Reliable Chassis: Dongfeng single-cab cab; blue license plate—drivable with Class C driver’s license, unrestricted in urban driving zones; compliant with China VI emissions standards. • Efficient Bodywork: 5-cubic-meter large-capacity tank, integrated with high-pressure flushing and vacuum suction systems—capable of continuously cleaning 2–3 manhole sections per operation. • Responsive After-Sales Support: Lifetime service for Chengli bodywork; nationwide warranty coverage for Dongfeng chassis; spare parts shipped within 24 hours. On one occasion, the customer reported a hydraulic pump failure—the issue was diagnosed, repaired, and resolved within just 12 hours. For the 2024 renewal, Chengli upgraded the hydraulic system to a dual-pump, dual-circuit design based on customer feedback—further enhancing suction efficiency. Additionally, rear-view cameras and blind-spot monitoring systems were installed to better support operations in narrow streets. Core technical specifications of the selection plan are as follows: Parameter 2022 Initial Procurement Plan 2024 Renewal Optimized Plan Chassis Model Dongfeng Single-Cab (China VI) Dongfeng Single-Cab (China VI) Tank Capacity 5 m³ 5 m³ Emission Standard China VI China VI Rated Occupancy (Cab) 2 persons 2 persons Hydraulic System Single-pump, single-circuit Dual-pump, dual-circuit (upgraded) Auxiliary Equipment Basic reversing radar Rear-view camera + blind-spot monitoring (newly added) Unit Landed Price (incl. tax) Approx. RMB 150,000 Approx. RMB 150,000 Delivery Lead Time 15 days 12 days Note: Prices and delivery timelines above are referenced from publicly available tender documents and official Chengli quotations; actual terms shall be governed by the signed contract. III. What Does This Renewal Contract Signify? Key Insights for Government Procurement Selection This renewal case offers valuable reference insights for municipal sanitation procurement departments: • Product stability is the cornerstone of contract renewal. The absence of major failures over two years of operation validates the robustness and reliability of the selected conf