The Sinotruk HOWO 6×4 chassis is a mainstream platform for domestically produced water tanker trucks, widely used in municipal watering, fire fighting, dust suppression in engineering projects, and cross-border transportation. A 40,000-liter (40m³) tanker truck is considered a large-capacity heavy-duty water tanker, commonly found in mines, large infrastructure projects, or long-distance water transport needs in arid regions. This specification exceeds that of conventional urban water sprinkler trucks (typically 10–25m³), and is closer to the category of semi-trailer water tanker trailers or special engineering vehicles.