a vehicle for travel along rice field levees and the like to spray chemicals upon such levees so as to control the growth of unwanted vegetation thereon . the vehicle includes a frame member having first and second sides . a pair of wheels are pivotally mounted to each side of the frame through elongated arm members in such a manner so as to hold the frame high above the supporting surface of the vehicle . the wheels mounted on each side of the frame are simultaneously driven by a motor separately from the wheels mounted on the other side of the frame in such a manner that the vehicle may be steered by individually controlling the rotation of the wheels on either side of the vehicle to thereby allow &# 34 ; skid steer &# 34 ; type steering of the vehicle .