Government procurement case of National VI Dongfeng 3308 mm wheelbase sewage treatment vehicle in Guiyang: A comprehensive walkthrough from initial planning to delivery. Under the humid and hot climate of Southwest China, selecting and procuring sewage treatment vehicles poses a significant challenge for municipal sanitation departments. A municipal sanitation department in Guiyang (hereinafter referred to as 'the unit') faced its first-ever procurement task for sewage treatment vehicles in 2025: newly constructed sewage treatment stations urgently required a batch of reliable, corrosion-resistant specialized vehicles due to high-frequency operations during the rainy season. Based on publicly available tender information, the unit set a budget ceiling of approximately RMB 277,000, and ultimately selected the National VI Dongfeng 3308 mm wheelbase sewage treatment vehicle supplied by Chengli Special Purpose Vehicle Co., Ltd., receiving positive feedback after delivery. This article details the vehicle selection process, Chengli’s end-to-end consulting support, delivery and trial operation, and frequently asked questions—providing reference guidance for other institutions. I. Project Background: First-Time Procurement from Scratch The unit was established in 2023 and is responsible for sewage treatment and sanitation services within a newly developed industrial park under its jurisdiction. As this was its inaugural procurement, the team lacked experience in selecting specialized vehicles and encountered three major challenges: (1) Guiyang’s persistently high humidity and prolonged rainy season made vehicle rust resistance and sealing component durability critical; (2) high operational frequency demanded continuous operation capability exceeding eight hours; and (3) limited budget necessitated balancing performance and cost-effectiveness. Initially reviewing multiple models based on public tender information, the unit struggled with indecision due to insufficient understanding of official vehicle certification parameters and chassis compatibility. In this context, the unit contacted Chengli Special Purpose Vehicle Co., Ltd. through industry referrals. Chengli Sales Manager Zhang Yue (Tel: +86 ) and his team provided full-cycle consulting support. As one of China’s largest specialized vehicle manufacturers—with 946 product specifications covering 44 categories—Chengli’s National VI Dongfeng 3308 mm wheelbase sewage treatment vehicle (e.g., model CLW5070GSSD6, certified per official announcements) has already been successfully deployed across multiple projects in Southwest China. II. Vehicle Selection Process: Chengli’s End-to-End Consulting and Customized Solutions Chengli’s team first analyzed core requirements for sewage treatment vehicles under Guiyang’s humid, hot environment—specifically focusing on anti-corrosion coating, sealing component durability, and high-load performance. Per the unit’s tender requirements, the vehicle chassis had to be Dongfeng-series (nationwide warranty coverage), while the superstructure needed corrosion resistance and suitability for frequent rainy-season operations. Chengli proposed the following solution: Chassis Selection: Dongfeng 3308 mm wheelbase chassis meeting National VI emission standards—compliant with Guiyang’s environmental regulations and backed by nationwide warranty service. Superstructure Customization: Reinforced anti-corrosion coating process applied to main tank and pipelines using epoxy resin paint to enhance corrosion resistance; sealing components made from moisture- and heat-resistant rubber to extend service life. Operational Capability: Equipped with a high-power self-priming pump and filtration system, enabling approximate single-batch treatment capacity of 5 cubic meters—ideal for industrial park wastewater cleanup. Delivery Timeline: Manufactured locally in Suizhou, Chengli typically delivers standard models within 7–15 days; given the unit’s urgent r