HIGHW SPEED OF40MPH VEHICLE SHIFTED WITH HEAVY WHEEL VIBRATION VEHICLE WAS UNSTABLED AND REPORTED THIS COMPLAINT TO THE FACTORY. WHEN MAKIN A TURN IF THERE WAS A CRACK OR POT HOLE IN THE STREET THE VEHICLE HAD A TENDENCY TO SHIFT OFF THE WHEELS LEANING TO LEFT. IF IT RAINS THE VEHICLE WOULD SLIDE TO THE LEFT. *AK