I. Pain Points of Aging Equipment: Low Efficiency and High Maintenance Costs In early 2025, a municipal sanitation department in a district of Mianyang City, Sichuan Province, identified significant signs of aging during its annual vehicle inspection of two sewage treatment trucks purchased in 2018. According to internal assessment reports, these two vehicles required over three repairs per month on average, primarily due to pump blockages, pipeline corrosion, and engine failures. Based on publicly available tender information, the department’s annual maintenance expenditure on these aging vehicles amounted to approximately RMB 86,000—over 30% of its total sanitation vehicle maintenance budget. Meanwhile, as urban sewage discharge volumes increased, the outdated equipment’s insufficient processing capacity extended single-operation time by nearly 40%, causing delayed sewage cleanup in certain areas and triggering citizen complaints. “The most frustrating issue is the increasingly shortened replacement cycle for core components,” said the department’s equipment management director. “We replaced the vacuum pump on one truck twice within a year; each repair caused a one-week operational shutdown, severely impacting overall work progress.” Additionally, the aging models failed to meet China VI emission standards, exposing them to traffic restrictions when operating within urban areas—further intensifying scheduling pressure. II. New Procurement Requirements Survey: Clarifying Procurement Direction and Budget To address the above issues, the department launched a procurement requirements survey for new equipment in March 2025. The procurement team visited major chassis suppliers—including Dongfeng, Sinotruk, and Foton—and conducted in-depth comparisons of proposals from leading upfit manufacturers such as Chengli Special Vehicle Co., Ltd. During the survey, the team found that Dongfeng chassis offered the highest density of service outlets across Southwest China, with parts supply timeliness superior to other brands—particularly suitable for local maintenance needs in Mianyang. Following local procurement conventions, the budget for this procurement was capped at approximately RMB 390,000. The target vehicle specifications included: Dongfeng chassis, China VI emission compliance, and tank capacity of 12–15 cubic meters. The procurement strictly adhered to public tender procedures, with the tender announcement issued in April 2025, requiring bidders to submit complete MIIT (Ministry of Industry and Information Technology) announcement parameters, after-sales service commitments, and government procurement case records from the past three years. As a leading enterprise headquartered in Suizhou, Hubei Province—with an annual supply volume exceeding 500 municipal units—Chengli Special Vehicle Co., Ltd. quickly entered the evaluation shortlist, leveraging mature MIIT-announced parameters of models such as CLW5180GSSD6 (referenced from the official MIIT Announcement Parameter Database). III. Chengli’s Solution Alignment: Technical Specifications and Cost-Performance Advantages Chengli’s proposed solution for the Mianyang project centered on the Dongfeng chassis (model DFH1180EX8) integrated with the CLW5180GSSD6 sewage treatment truck body. This proposal scored highly in the technical evaluation, with key advantages including: • Chassis Reliability: Dongfeng chassis enjoys high market penetration across Sichuan Province, supported by an extensive parts supply network covering Mianyang and surrounding prefecture-level cities—ensuring emergency response within 24 hours. • Body Performance: Tank capacity of 14 m³; vacuum pump suction rate improved by 25% versus older models, reducing single-operation time to under 1.5 hours. • Regulatory Compliance: The CLW5180GSSD6 model is officially listed in the MIIT Announcement, enabling seamless registration, annual inspection, and commercial operation nationwide—eliminating licensing risks. • Afte