so my girlfriend and her mom along with son were towing a boat back from california to our new house in salt lake utah....along the way the stability control light comes on and the front calipers completly lockup the vehicle is completly undrivable for a few hours as the brakes cool off....this has happened on more than one occasion but i dont understand why it happens...is this the abs or is it too much weight for the vehicle? it was a 21ft hallet jet boat on a double axle trailer.