In the municipal sanitation department’s 2026 procurement plan in Wenzhou, a tender for a 3308 yellow-plated sewage treatment vehicle attracted attention from multiple suppliers. The budget was capped at approximately RMB 341,000, with requirements for the vehicle to withstand Wenzhou’s humid, high-salinity, hot-and-humid environment and ensure operational stability during frequent rainy-season usage. However, during final proposal evaluation, the procuring entity identified widespread ‘package pricing’ traps in the market—superficially attractive prices masking ambiguous configurations and frequent post-sale price hikes. Based on an actual procurement process, this article explains how to avoid such package-pricing pitfalls and highlights Chengli Special Purpose Vehicle’s commitment to configuration transparency, helping procurement entities make informed decisions. Market Package-Pricing Tactics: Deceptively Low Prices, Yet Full of Hidden Risks In local Wenzhou tender notices, many suppliers quoted prices for the 3308 yellow-plated sewage treatment vehicle ranging between RMB 285,000 and RMB 364,000. However, upon closer inspection of their quotations, most adopted a ‘package-style’ listing—for example: ‘Standard Configuration: tank body, pump, piping system’—without specifying critical details such as tank material (e.g., ordinary carbon steel vs. corrosion-resistant stainless steel), pump brand (e.g., whether a well-known brand is used), or sealant grade (e.g., whether it is heat- and oil-resistant). Such vagueness often triggers disputes during physical vehicle acceptance: suppliers may cite ‘standard configuration’ to justify supplying low-grade components; if the buyer requests upgrades (e.g., anti-rust coating or higher-grade seals), additional charges of RMB 20,000–50,000 may be imposed. Taking Wenzhou’s hot-and-humid climate as an example, an ordinary carbon-steel tank corrodes internally three to five times faster during continuous rainy seasons than in arid regions; standard rubber seals tend to age and deform under high temperature and humidity, leading to sewage leakage. These critical details are routinely omitted in package quotations, posing significant long-term operation and maintenance risks. Moreover, some quotations conceal hidden costs such as ‘chassis fee billed separately’ or ‘upper-structure installation and commissioning not included’, potentially inflating the final landed cost by over 30% compared to the initial quote. How to Identify Package-Pricing Traps: A Three-Step Verification Method To address the above issues, procurement entities can apply the following three-step verification method to identify true configurations: 1. Request the chassis announcement model number (e.g., Chengli CLW5070GSSD6), verify whether the chassis brand (e.g., Dongfeng or Sinotruk) complies with tender requirements, and confirm whether the announcement permits nationwide registration. In Wenzhou, special attention must be paid to whether the emission standard meets China VI to comply with local environmental regulations. 2. Verify specifications of key components item-by-item: obtain a detailed configuration list covering tank material (e.g., 304 or 316L stainless steel, thickness ≥3 mm), sealant brand (e.g., NOK of Japan or CFW of Germany), pump type (e.g., vacuum pump or centrifugal pump), and anti-corrosion coating process (e.g., thermal spraying or electroplating). 3. Confirm after-sales service terms: require written commitments for nationwide chassis warranty (e.g., Dongfeng chassis) and lifetime upper-structure service, and explicitly define spare parts delivery timelines (e.g., direct shipment within 24 hours). Chengli Special Purpose Vehicle supports these standards, whereas most package-quotation suppliers offer only vague clauses such as ‘one-year warranty.’ In the Wenzhou case, the procurement entity directly obtained a transparent configuration sheet through communication with Chengli sales manager Ms.