I. Procurement Background and Scenario Pain Points Winter temperatures in the Yinchuan region frequently drop below -15°C, with extreme conditions reaching -25°C. A municipal sanitation department planned to procure a batch of blue license plate, 5 m³ sewage suction trucks by the end of 2025, for emergency drainage network unclogging and routine sludge removal during winter. The procuring party explicitly required: reliable cold-weather starting performance, low-temperature hydraulic system stability, and a comprehensive winter maintenance plan. This procurement was conducted via open tender, with a budget cap of approximately RMB 134,000 per unit, and a total requirement of 5 units. After multiple rounds of evaluation and on-site inspections, Chengli Special Purpose Vehicle Co., Ltd. (hereinafter referred to as "Chengli")'s Dongfeng single-cab chassis sewage suction truck (reference model CLW5070GSSD6) was ultimately selected. This article provides an in-depth analysis of this procurement case across four dimensions: configuration proposal, value of optional equipment, pricing rationale, and frequently asked questions. II. Comparison: Standard Version vs. High-Configuration Version Given Yinchuan’s unique climatic conditions, the procuring party requested two configuration proposals from suppliers: a "Standard Version" meeting basic operational requirements, and a "High-Configuration Version" specifically enhanced for extreme winter conditions. Below is a detailed comparison table: | Configuration Item | Standard Version | High-Configuration Version | Optional Equipment Notes | |--------------------|------------------|----------------------------|--------------------------| | Chassis Model | Dongfeng Single-Cab (China VI) | Dongfeng Single-Cab (China VI) | Identical chassis—original Dongfeng factory unit | | Tank Capacity | 5 m³ | 5 m³ | Meets baseline sewage suction requirements | | Cold-Weather Starting System | Standard battery + fuel preheating | Low-temperature battery + engine intake preheating + fuel heater | Ensures one-button start at -25°C | | Hydraulic System | Standard hydraulic pump + conventional hydraulic oil | Low-temperature hydraulic oil + hydraulic tank heating device | Enhanced hydraulic responsiveness and stability under sub-zero conditions | | Sewage Suction Equipment | Standard self-priming vacuum pump | High-flow self-priming pump + freeze-resistant sealing components | Improves operational efficiency during winter | | Winter Maintenance Kit | Not included | Antifreeze coolant, snow tires, thermal insulation covers | Comprehensive winter maintenance accessories included | | Reference Unit Price (incl. tax, delivered) | ~RMB 98,000 | ~RMB 115,000 | Based on Chengli’s 2026 quotation and public tender data | As shown above, the Standard Version satisfies routine operational needs at a lower cost; the High-Configuration Version, however, incorporates targeted enhancements for Yinchuan’s severe cold climate. Although priced approximately RMB 19,000 higher, it significantly reduces winter failure rates and extends equipment service life. Ultimately, the procuring party selected the High-Configuration Version, judging its overall cost-effectiveness superior and aligned with the principle of "procure once, benefit long-term." III. Value Analysis of Optional Equipment and Chengli’s Transparent Pricing Logic In this procurement, several key optional components added to the High-Configuration Version deliver value far exceeding their incremental cost: Cold-Weather Starting System: Morning temperatures in Yinchuan winters often fall below -15°C, rendering standard batteries and fuel preheating insufficient for reliable engine starts. The High-Configuration Version features a low-temperature battery and engine intake preheating system, ensuring smooth vehicle startup even at -25°C. According to Chengli’s service records, this configuration reduces winter starting failures by approximately 80%. Low-Temperatur