if you look at the german half tracks vs americain half tracks you will notice the german models ran the track 3/4 of the way under the vehicle the tires were used to steer in the highway only and the tracks had a controled differential like a thiokol for steering at low speed and off road the german rigs had an overlaping road wheel system wwith inner and outer road wheels overlaping,i suspect to smooth out the rde on wast board