what would cause the front tires to get cupped wwith only 13000 miles ? on 2010 Ford Ranger

i have the tires every 5000 miles and i dont think its out of alinement because it drives ok it will hold a straight line when you let go of the steering wheel.

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1 answer 1 comment
IT SOUNDS LIKE THE FRONT NEEDS ALIGNMENT. GO TO A GOOD ALIGNMENT SHOP AND HAVE THE CHECK IT OUT THE HAVE MACHINES THAT YOU CAN RUN YOUR CAR OVER AND IT WILL TELL THEM IF IT NEED AN ALIGNMENT
if its not out of alignment could the front wheel bearings beign lose would that cause the cupping?