I. Case Background: Procurement Challenges Faced by a Municipal Sanitation Department in Xi'an In early 2024, a municipal sanitation department in Xi'an launched a procurement project for sewage treatment vehicles, planning to acquire three (3) new Dongfeng sewage treatment vehicles for urban sewer network maintenance and emergency response. The budget was capped at approximately RMB 392,000 per unit, with a total budget of around RMB 1,175,000. The project attracted bids from multiple suppliers, including Chengli Special Purpose Vehicle Co., Ltd. (hereinafter referred to as "Chengli") and several small- to medium-sized upfitters. However, during the tender process, some suppliers submitted bids 20% below market price—approximately RMB 313,000 per unit—raising concerns among the procuring entity. After multiple rounds of technical evaluation and on-site inspections, the procuring entity ultimately selected Chengli’s solution, priced at approximately RMB 320,000 per unit (based on publicly available tender information), for a total contract value of about RMB 960,000. This article analyzes the case from the perspective of the "low-price trap" and explains how Chengli delivers high cost-performance value. II. Analysis of the Low-Price Trap: Risks Associated with Bids 20% Below Market Price In government procurement, low-bid tenders often conceal risks such as downgraded configurations, inferior materials, and inadequate after-sales service. Taking this Xi'an municipal sanitation department case as an example, certain suppliers quoted RMB 313,000 per unit—significantly lower than the market average of RMB 350,000—appearing to offer savings but potentially introducing the following hazards: • Chassis and Engine Downgrades: Use of non-OEM or outdated chassis models (e.g., older Dongfeng EQ series instead of the latest model), resulting in insufficient power output and failure to meet emission standards. • Sewage Treatment System Reductions: Adoption of low-efficiency filter tanks and substandard pumps, reducing treatment capacity by over 50%, rendering the vehicle incapable of handling Xi’an’s high-silt-content wastewater. • Inadequate Dustproof Sealing: Poor adaptability to desert-like operating conditions; seals degrade rapidly, causing secondary pollution. • Short Filter Maintenance Intervals: Standard filter elements last only 3–6 months, whereas premium-grade filters can operate effectively for up to 12 months—increasing long-term operational and maintenance costs. • Lack of After-Sales Support: Only one-year warranty coverage offered, without 24-hour direct spare parts delivery, making it impossible to respond promptly to unexpected failures. According to the official announcement parameters for Chengli’s CLW5180GSSD6 model, the new Dongfeng sewage treatment vehicle comes standard with an OEM Dongfeng chassis, a China VI-compliant engine, high-precision filtration tanks, and an intelligent control system—whereas low-price alternatives likely substitute generic or off-brand components. During technical evaluation, the procuring entity explicitly required bidders to submit chassis compliance certificates and certified wastewater purification efficiency test reports—requirements that all low-price bidders failed to fulfill. III. Common Configuration Reduction Tactics and Chengli’s Countermeasures In the Xi’an case, the configuration reduction tactics employed by low-price suppliers are highly representative. Below is a comparison of typical practices versus Chengli’s approach (based on the CLW5180GSSD6 model): Configuration Item | Common Cost-Cutting Tactics in Low-Price Solutions | Chengli’s Solution (Reference CLW5180GSSD6) | Cost Differential Chassis & Engine | Use of outdated Dongfeng EQ-series chassis; China V emission standard | OEM Dongfeng latest-generation chassis; China VI emission standard; engine power 160 kW | Approx. RMB 20,000–30,000 Sewage Treatment System | Single-stage filtration tank; treatment efficienc