What could cause a wheel bearing on a 14 bolt rear end to starve for oil and seize only on one side?

Hi, With any solid axle if the oil level is at all low it starves the left side first because all highways taper to the right for drainage so its like the right side is lower than the left and gravity takes care of the rest, of course if your car has 200K on it look for it to happen any time, if your car has independent rear suspension the side with the weakest dust seal goes first. .