In autumn 2025, a municipal sanitation department in Tianjin launched a second procurement initiative for 3-cubic-meter sludge tipper trucks. The procurement budget was capped at approximately RMB 123,000, with the Dongfeng D6 blue license plate chassis specified as the preferred model. Why a second procurement? Because the first batch of vehicles encountered multiple issues under Tianjin’s winter low-temperature conditions—difficult engine starting, sluggish hydraulic system response, and cargo box icing causing inefficient unloading. This time, the procurement team learned from prior experience and conducted more rigorous evaluations—from chassis selection and body-upfit configuration to after-sales support. This article uses the case as a reference to outline the decision-making logic behind the second procurement, offering insights for industry peers. I. Pitfalls of the First Procurement: Three Key Winter Low-Temperature Challenges In early 2024, the department procured three 3-cubic-meter sludge tipper trucks from a certain brand, all built on the Dongfeng D6 chassis with standard upper-body configurations. During their first winter of operation, problems emerged en masse: • Failed Cold-Weather Starting: Under Tianjin’s winter temperatures of –10°C to –15°C, engines struggled to start—requiring repeated preheating or even external battery assistance—severely impacting operational efficiency. • Hydraulic System Failure at Low Temperatures: Increased hydraulic oil viscosity slowed lifting and dumping actions; sometimes multiple attempts were needed to complete a single unloading cycle. Hydraulic lines became brittle in the cold, leading to leakage. • Cargo Box Icing and Blockage: High-moisture sludge froze onto inner cargo box walls during winter, causing severe adhesion during unloading—necessitating manual cleaning, thereby increasing safety risks and time costs. The root cause lay in the fact that, during the initial procurement, the buyer had not specified climate-specific technical requirements for Tianjin’s winter conditions, nor had the supplier provided low-temperature-adapted configurations. As a result, the vehicles performed acceptably under moderate conditions but became inoperable—or ‘broke down’—during harsh winter weather. II. ‘Pitfall-Avoidance’ Strategy for the Second Procurement: From Tender Documents to Acceptance Criteria In autumn 2025, the department initiated its second procurement, maintaining a budget cap of approximately RMB 123,000 (based on publicly available tender information). This round featured three core technical requirements: • Cold-Weather Starting Performance: Chassis must be equipped with low-temperature preheating devices (e.g., intake air preheaters or fuel heaters) to ensure one-button engine start capability at –15°C. • Low-Temperature Hydraulic Stability: Hydraulic systems must use low-temperature-resistant seals; hydraulic oil must meet –20°C operational specifications, and a hydraulic oil heating device must be installed. • Winter Maintenance Plan: Suppliers must provide a comprehensive winter operation and maintenance manual—including antifreeze replacement intervals, hydraulic system drainage procedures, and recommendations for anti-adhesion coatings inside the cargo box. During supplier evaluation, the procurement team prioritized Chengli Special Purpose Vehicles. As a leading enterprise based in Suizhou—the national hub for special-purpose vehicle manufacturing—Chengli has extensive real-world winter deployment experience across Northeast and North China. Its Dongfeng D6 chassis (model CLW5070GSSD6) has been specifically optimized for low-temperature environments: it features a standard cold-start assist system; hydraulic lines adopt double-layer thermal insulation design; and the upper-body cargo box offers optional stainless-steel interior lining to minimize ice adhesion and material sticking. Ultimately, the department received three Chengli Dongfeng D6 blue