I. Case Background: Why Adopt the 'Trial-First' Approach? In 2025, a municipal sanitation department (hereinafter referred to as the 'procuring entity') planned to procure a batch of yellow-plate sewage treatment vehicles (model 3308) due to increased demand for sewer network maintenance within its jurisdiction. Faced with multiple brands and configurations available on the market, the procuring entity opted for a 'trial-first' strategy—testing one unit first to verify performance before committing to bulk procurement—rather than initiating a formal tender process directly. While uncommon in government procurement, the head of the procuring entity explained: 'Sewage treatment vehicles are special-purpose vehicles; judging actual performance solely based on technical specifications and PowerPoint presentations is unreliable. We aim to collect real-world operational data through physical vehicle trials, enabling objective, evidence-based procurement decisions.' Ultimately, the procuring entity selected Chengli Special Purpose Automobile Co., Ltd. (hereinafter 'Chengli') to supply the CLW5070GSSD6 model (modified on the 3308 chassis) as the trial vehicle. II. Trial Performance: 30-Day Field Test Results The trial period lasted 30 days, covering three typical sewer network maintenance scenarios: Scenario 1: Sewage Manhole Cleaning in Urban Residential Communities — The trial vehicle completed suction cleaning operations at 12 manholes within 15 days, reducing average operation time per job by 25% compared to legacy equipment. Scenario 2: Municipal Road Drainage Pipe Unclogging — Leveraging its high-pressure cleaning function, the vehicle cleared three severely blocked stormwater pipelines, improving operational efficiency by approximately 30%. Scenario 3: Emergency Floodwater Drainage — Following a heavy rainstorm, the trial vehicle operated continuously for 8 hours, pumping and discharging approximately 40 cubic meters of floodwater without failure. According to on-site records maintained by the procuring entity: • Vehicle Stability: No oil leakage or abnormal noises observed; engine (China VI emission standard) ran smoothly. • Operational Convenience: Measured tank capacity approx. 3.5 m³ (consistent with CLW5070GSSD6 official specifications); suction hose length: 6 meters—sufficient to cover most operational radii. • After-Sales Response: Chengli’s after-sales engineers proactively conducted three on-site follow-up visits during the trial period and remotely guided resolution of a minor fault once. The procuring entity commented: 'The trial vehicle’s performance exceeded expectations—especially its durability under continuous operation—which has strengthened our confidence in proceeding with bulk procurement.' III. Market Comparison: Chengli CLW5070GSSD6 vs. Competitors Concurrently with the trial, the procuring entity also evaluated two other leading brands’ equivalent-grade sewage treatment vehicles (Brand A and Brand B), focusing on the following key dimensions: Comparison Item | Chengli CLW5070GSSD6 | Brand A (Same Chassis) | Brand B (Same Chassis) Chassis Brand | Dongfeng / Sinotruk / Foton, etc. (3308 optional) | Dongfeng | Sinotruk Tank Capacity | Approx. 3.5 m³ (official specification) | Approx. 3.3 m³ | Approx. 3.6 m³ Emission Standard | China VI | China VI | China VI After-Sales Service | Chassis: Original manufacturer nationwide warranty; Superstructure: Lifetime service | Chassis: Nationwide warranty; Superstructure: 1-year warranty | Chassis: Nationwide warranty; Superstructure: 2-year warranty Reference Price (based on publicly disclosed tender information) | Approx. RMB 210,000–250,000 per unit | Approx. RMB 240,000–280,000 per unit | Approx. RMB 220,000–260,000 per unit Delivery Lead Time (per local procurement practice) | 7–15 days for standard models | Approx. 20–30 days | Approx. 15–25 days Parts Availability