Government Procurement Case and Bid-Winning Solution Analysis for the National VI Dongfeng 3308 mm Wheelbase Sewage Treatment Vehicle in Linfen City As part of an annual procurement plan by a municipal sanitation department in Linfen City, two National VI emission-standard sewage treatment vehicles were publicly tendered to address aging pipeline renovation and emergency sewage discharge needs. The chassis model was specified as Dongfeng with a 3308 mm wheelbase. This case reflects grassroots units’ dual considerations of vehicle power, off-road capability, and environmental compliance, while also demonstrating Chengli Special Purpose Vehicles’ mature technical response and cost-control solutions. This article analyzes key bidding stages step-by-step, starting from the tender process, to provide reference for similar procurements. I. Core Requirements in the Tender Document According to publicly available tender information, the core requirements for this procurement focused on three aspects: Chassis and Emission Standard: Must comply with National VI emission standards, feature a 3308 mm wheelbase, and use a Dongfeng-branded chassis—ensuring excellent maneuverability on complex urban and rural road conditions in Linfen City, while meeting stringent exhaust emission regulations imposed by local environmental authorities. Sewage Treatment Capacity: Must possess sewage suction, solid-liquid separation, temporary storage, and emergency discharge capabilities. The tank’s effective volume must be no less than 3.5 m³; the pump system must support a self-priming height ≥7 meters and include anti-overflow devices to prevent secondary contamination. After-Sales Service and Localized Support: Suppliers must maintain an authorized service station within Shanxi Province, guaranteeing fault-report response within 24 hours. The superstructure must carry a minimum 2-year warranty, and operational training must be provided. Additionally, the budget was capped at approximately RMB 431,000 per unit (per publicly disclosed tender data), with clear thresholds set for supplier qualifications and prior performance—especially in similar municipal projects. II. Chengli’s Technical Response Solution Leveraging its proprietary product database—including 946 product records and 108 MIIT-certified models such as CLW5070GSSD6—Chengli Special Purpose Vehicles delivered a customized technical solution aligned precisely with the tender requirements: Chassis and Powertrain: Utilizes the Dongfeng 3308 mm wheelbase National VI chassis equipped with Yunnan or Yuchai engines delivering 95–115 hp, paired with a 5-speed transmission—meeting both urban driving restrictions and heavy-duty operational demands. Full regulatory certification ensures seamless registration, annual inspection, and commercial operation permit issuance at Linfen’s vehicle administration office. Sewage Treatment System: Tank fabricated from high-quality Q235 carbon steel plates (Wuhan Iron and Steel Group), 4 mm thick, with a capacity of 3.8 m³—exceeding the tender’s 3.5 m³ requirement. Equipped with Weilong or Yifeng vacuum pumps achieving maximum suction depth up to 8 meters—surpassing the tender-specified requirement. Internal baffles and anti-sloshing plates enhance driving stability; a hydraulically actuated rear discharge port enables rapid unloading. Intelligence and Safety Features: Includes liquid-level alarm systems to prevent tank overfilling; optional high-pressure cleaning reels (30-meter hose) are available for pipeline unclogging. Overall vehicle dimensions are controlled within 5995 × 2100 × 2600 mm—complying with Blue-Plate C-class driver’s license requirements (with relaxed enforcement in certain cities), thereby lowering operator qualification barriers. This solution received high marks from tender evaluation experts, who noted its “exceptional parameter alignment and appropriately redundant configuration.” III. Commercial Quotation Strategy Chengli adopted a “d