In recent years, as urban wastewater treatment requirements have become increasingly refined and sophisticated, municipal sanitation departments across the country often face a common dilemma when procuring special-purpose vehicles: Why do quotations for the same 'Dongfeng Wing-Opening Wastewater Treatment Vehicle' vary by tens of thousands of yuan among different suppliers? Even within the same supplier’s ‘package price,’ the quoted total may appear attractive, yet the actual delivered configuration frequently deviates significantly from tender specifications. This article takes a 2024 government procurement case in a coastal city (related to Weihai) as its entry point, thoroughly dissecting prevalent ‘package traps’ in the market, and introduces Chengli Special Purpose Vehicle Co., Ltd. (hereinafter referred to as 'Chengli') — how it delivers compliant, high-value-for-money special-purpose vehicles to customers through transparent configurations and factory-direct sales. I. Case Background: Actual Procurement Requirements of a Municipal Sanitation Department in Weihai In the second half of 2024, a municipal sanitation department in Weihai planned to procure one Dongfeng wing-opening wastewater treatment vehicle for urban pipeline cleaning and emergency wastewater treatment. According to local procurement practices, the budget was capped at approximately RMB 389,000, with requirements specifying a Dongfeng-branded chassis, upper-body equipment including a wastewater separation system, self-priming pump, and high-pressure cleaning unit, all compliant with China VI emission standards and eligible for official registration and operation. During the open tender process, four suppliers submitted quotations. Among them, two offered ‘package prices’: one quoted RMB 285,000 and another RMB 312,000 — both claiming to include ‘full-range Dongfeng chassis + standard wastewater tank + self-priming pump.’ However, upon carefully reviewing the configuration lists, the procuring entity discovered that the so-called ‘standard’ configurations ambiguously specified the wastewater tank capacity as ‘4–8 m³,’ listed the self-priming pump brand vaguely, and marked the high-pressure cleaning unit as ‘optional.’ Such ambiguous wording represents a classic ‘package trap’ — using low headline pricing to attract attention while leaving critical specifications undefined, then later charging extra or substituting lower-spec components to recover margins. II. Common ‘Package Trap’ Tactics in the Special-Purpose Vehicle Procurement Market: How Buyers Get ‘Trapped’ In the special-purpose vehicle procurement sector, ‘package traps’ typically manifest in the following forms: • Ambiguous Key Parameters: e.g., ‘wastewater tank capacity: 4–8 m³’ or ‘power output: selectable,’ omitting precise values — leading buyers to mistakenly assume high-end configurations. • Mislabeling Low-Spec Components as High-Spec: e.g., labeling an ordinary carbon-steel tank as a ‘reinforced tank,’ despite insufficient wall thickness. • Optional Accessories Priced Separately: Only basic configurations are included in the quotation; commonly used accessories such as high-pressure spray nozzles, automatic hose reels, and filter screens incur additional charges. • Disconnected Chassis and Upper-Body Pricing: The chassis price appears low, but hidden fees — such as ‘modification fees’ or ‘commissioning fees’ — are embedded in the upper-body section, ultimately pushing the final total far beyond budget. Taking the Weihai case as an example, the supplier quoting RMB 285,000 merely listed the ‘Dongfeng chassis’ model without specifying the drive configuration; for the upper-body self-priming pump, it stated only ‘domestic premium quality’ — without naming the brand or warranty period. Once awarded the contract, this supplier could substitute surplus chassis stock or pumps from lesser-known manufacturers, severely compromising the vehicle’s real-world performance. III. Chen