Zunyi Dongfeng double-cab sewer cleaning truck (blue license plate, 3-cubic-meter capacity) government procurement case: Pre-purchase trial and bid-winning solution analysis. In Zunyi, Guizhou Province—where frequent rainy seasons and complex terrain pose persistent challenges to urban drainage system maintenance—municipal sanitation authorities have long struggled with efficient and safe sewer cleaning. During routine pipeline inspections in summer 2025, the Urban Management Bureau of a district in Zunyi discovered severe sediment accumulation in drainage wells across multiple aging streets. Traditional manual cleaning methods proved inefficient and posed safety risks. After multiple rounds of technical evaluation, the bureau decided to procure a batch of Dongfeng double-cab sewer cleaning trucks (blue license plate, 3-cubic-meter capacity) for routine maintenance and emergency response. This article comprehensively documents the unit’s full process—from pilot trial to bulk procurement—and interprets the underlying technical rationale of the winning bid solution. Vehicle Configuration and Budget Reference Configuration Dimension Recommended Solution Selection Rationale Vehicle Type Special-purpose vehicle Determined according to local procurement purpose, road conditions, and superstructure functionality. Chassis Selection Mainstream chassis brands including Dongfeng, Foton, Jiangling, and Sinotruk Based on official announcement compliance, load-bearing capacity, emission standards, and after-sales service accessibility. Superstructure Configuration Standard configuration plus commonly selected optional features Customizable per operational scenarios—e.g., sanitation, municipal works, emergency response, industrial parks, or enterprise use. Price Reference Base quotation plus 10–15% budget contingency Final price subject to confirmed vehicle configuration, official announcement, chassis selection, and contractual terms. Service Recommendation Contact Chengli directly to verify vehicle availability, configuration details, and delivery lead time; avoid procurement decisions based solely on online low-price listings. I. Project Background and Requirements Analysis Zunyi is located in the northeastern part of the Yunnan–Guizhou Plateau and features a subtropical humid monsoon climate, with an average annual rainfall exceeding 1,000 mm. From May to September each year—the peak rainy season—its drainage infrastructure operates under sustained high-load conditions. Prior to launching a public tender, the district’s Urban Management Bureau clearly defined the following core requirements: • Vehicle specification: Blue license plate, drivable with Class C driver’s license; 3-cubic-meter tank capacity; suitable for narrow urban alleyways. • Chassis selection: Dongfeng double-cab chassis, chosen due to extensive local Dongfeng service network coverage and convenient maintenance access. • Special performance: Rust-resistant coating and durable sealing components certified for operation in hot, humid environments. • Budget control: Based on local procurement norms, unit cost capped at approximately RMB 90,000–120,000 (per publicly disclosed tender information). II. ‘Pilot Trial First’ Strategy: Testing One Unit Before Committing to Procurement To avoid blind procurement, the bureau adopted a ‘pilot trial first’ approach: it requested one Dongfeng double-cab sewer cleaning truck (blue license plate, 3-cubic-meter capacity; model reference CLW5070GSSD6, compliant with official announcement parameters) from Chengli Special Purpose Vehicle Co., Ltd. for a 30-day field test. As a leading special-purpose vehicle manufacturer based in Suizhou, Chengli delivered rapid response service—the prototype vehicle arrived in Zunyi just five days after application submission. 2.1 Pilot Trial Performance Summary The prototype vehicle was delivered on July 5, 2025, and the trial concluded on August 5, 2025. During this period, the vehicle completed 18 op