It shall be unlawful to operate any vehicle upon public highways with a wheelbase between any two axles thereof of less than three feet, six inches when weight exceeds that allowed for one axle under RCW
46.44.042 or
46.44.041. It shall be unlawful to operate any motor vehicle upon the public highways of this state with a wheelbase between the frontmost axle and the rearmost axle of less than three feet, six inches.
For the purposes of this section, wheelbase shall be measured upon a straight line from center to center of the vehicle axles designated.