The special devices of the vehicle are water tank and sewage suction tank, which are mainly used for the cleaning and dredging of urban pipe network. When the current suspension is 1250 (mm), the corresponding rear suspension is 2150 (mm), and when the current suspension is 1450 (mm), the corresponding rear suspension is 1950 (mm). The transportation medium of sewage suction tank: liquid pollutant, density: 800 kg / m3, load mass: 9600 (kg), the effective volume of sewage suction tank is 12.6 m3, and the size of tank body (mm) × Diameter (mm): 5450 × 1900. Transportation medium of clean water tank: water, density: 1000 kg / m3, load mass: 3200 (kg), effective volume: 3.36 m3, cross section of clean water tank is composed of circular arc and polygon, cross-sectional area is 0.42 m2, and shape length (mm) of water tank is 4600. The two tanks cannot be fully loaded at the same time. Side protective material is Q235, and the connection method is that the connecting bracket is fixedly welded on the subframe girder. Rear protective material is Q235, Connection method: the bolt structure connector is fixedly welded at the rear end of the main vehicle, and the section size of the rear protective device (width) × Height) 50 × 120 (mm), rear protective height above the ground: 500 (mm). Absmodel and manufacturer: 3631010-C2000 / dongkeknoer commercial vehicle braking system (Shiyan) Co., Ltd., J ABS / Jiaozuo boryk Control Technology Co., Ltd. install driving recorder with satellite positioning function. Only 4350 + 1350 (mm) wheelbase chassis is adopted.