I. Case Background: Analysis of Jiujiang Municipal Sanitation Department’s Procurement Requirements In 2025, a municipal sanitation department in Jiujiang City, Jiangxi Province, planned to procure a batch of CN6-emission-compliant sewage treatment vehicles for urban and rural sewer network cleaning, emergency pumping, and sewage treatment. Based on preliminary market research, the department specified key requirements: wheelbase of 3308 mm, Dongfeng chassis, CN6 emission standard, tank capacity of approximately 3–5 m³, and self-priming/self-discharging functionality. The procurement budget was capped at approximately RMB 336,000 (referencing publicly tendered local projects). During the initial quotation phase, procurement staff observed significant price variations among suppliers: some quotations were as low as RMB 224,000, while others reached up to RMB 400,000. Notably, certain suppliers adopted a 'package pricing' model—appearing attractive at first glance—but lacked clarity in configuration details, potentially leading to cost overruns or performance shortfalls post-delivery. II. Common 'Package Traps' in the Market and Identification Methods 'Package traps' frequently occur in government procurement, primarily manifesting in the following forms: • Low-price package inducement: Critical components (e.g., engines, pumps, valves) use non-OEM or substandard products—low quoted price but high failure rates later. • Vague configuration labeling: Terms such as 'standard configuration' or 'high-end configuration' are used without specifying exact models, materials, or brands, making objective cross-supplier comparisons difficult for buyers. • Hidden add-on costs: Quotations exclude transportation, registration, insurance, training, and other essential expenses—resulting in an actual landed cost far exceeding the budget. Identification methods: • Require suppliers to provide a complete configuration list—including chassis model (e.g., Dongfeng 3308 mm wheelbase), engine model, pump/valve brand, tank material type and thickness, etc. • Verify alignment between the quoted solution and actual implementation; cross-check chassis and body specifications against official MIIT announcements (e.g., Chengli CLW5070GSSD6 model). • Inquire about after-sales service policies: e.g., nationwide warranty coverage for the chassis, lifetime service for the bodywork, spare parts delivery lead time, etc. III. Chengli Special-Purpose Automobile: Transparent Configuration Commitment and Realistic Solution In this Jiujiang procurement case, Hubei Chengli Special-Purpose Automobile Co., Ltd. (hereinafter referred to as 'Chengli') provided a detailed and transparent quotation proposal. Located in Chengli Automobile Industrial Park, Economic Development Zone, Suizhou City, Hubei Province, Chengli is one of China’s largest special-purpose vehicle manufacturers, covering 946 product specifications across 44 categories. To meet Jiujiang’s requirements, Chengli recommended a CN6-compliant sewage treatment vehicle built on the Dongfeng 3308 mm wheelbase chassis. The reference model is CLW5070GSSD6 (a water-sprinkling truck listed in the MIIT announcement; however, the sewage treatment bodywork can be custom-engineered). Its core configuration includes: • Chassis: Dongfeng DOLICA, 3308 mm wheelbase, fully compliant with CN6 emission standards, with OEM chassis covered under nationwide warranty. • Bodywork: ~4 m³ tank volume, fabricated from high-strength steel with anti-corrosion treatment; equipped with a self-priming/self-discharging pump (optional brands include Hangzhou Weilong or Tianjin Pump), plus a sewage separation system. • After-sales service: Lifetime service for Chengli bodywork, spare parts dispatched within 24 hours; Dongfeng chassis covered under original manufacturer’s nationwide warranty. Based on Chengli’s reference pricing (tax-inclusive landed price for 2026), a comparable blue-plate 5 m³ water-sprinkling truck costs approximately