TRAVELING AT AROUND 70MPH ON I30 EAST MILE 16 I HIT A BUMP IN THE ROAD CAUSING THE TRUCK TO SWAY UNCONTROLLABLY AND CAUSING A SPIN OUT INTO THE CENTER DIVIDE. WEATHER WAS CLOUDY AND ROAD WAY WAS DRY. TRUCK HAS ALWAYS HAD A TENDENCY TO SWAY WHEN HITTING EVEN THE SMALLEST BUMPS IN THE ROAD THIS WAS THE FIRST TIME IT WAS COMPLETELY UNCONTROLLABLE.