still off topic, but wouldn't just the rear two tires make the difference since they leave the last track?
Not whilst cornering - even a 4WSteer vehicle has a slightly different arc from front to rear and a 2WSteer conventional setup magnifies that effect. Keep in mind that if a vehicle or a group of vehicles come to a stop somewhere and "turn around" you can tell right away about which way they came and which way they went but if you hit their trail perpendicular to progress in either direction it is extremely hard to tell which way they came or which way they went without tracking that track sometimes hundreds of miles to their conclusion point, or, to their starting point. It is just one of many mechanisms to confuse things and I know that however effective it was, or was not, I saw countless embassy vehicles and military vehicles getting rotated every which way but normal in shops all around the world. HTH.