​Driven by the sustained growth of global fresh food e-commerce, outdoor activities, and emergency support needs, portable refrigerated trailers—key assets for flexible cold chain distribution—are undergoing an unprecedented technological transformation. Recently, several leading manufacturers have launched new generations of electric and intelligent refrigerated trailer solutions. The industry is rapidly shifting toward zero emissions, quiet operation, and remote smart control, offering cleaner, more efficient solutions for the "last-mile" of urban cold chain logistics.