A hitch attached extension for over sized cargo has a longitudinally extending frame member adapted to be removably attached to a trailer hitch of a motor vehicle. The power transmission device for automobile comprises a driving shaft, an output shaft a transmission, a differential gear part and a four-wheel drive part. The motor structure also includes a heat shield coupled directly to the motor so as to surround and cover the bearing pocket, with a portion of the heat shield being spaced from the bearing pocket. Mirror image orientations are envisioned to aid in retaining pressure differentials in opposed directions. The data determination circuit is configured to determine third data stored at a predetermined position using the combination of the first data stored in the first track and the second data stored in the second track as received in the first signal and the combination of the first data stored in the first track and the second data stored in the second track as received in the second signal.