Necessity is the mother of invention. One of the results of having a powerful four wheel drive machine that is that, rocks can be thrown back from the front tires to the rear wheels at the opposite corner. If a rock gets trapped and rotated between the wheel and caliper it can break the wheel. These Mud Flaps from Grounded 4 will help. The flaps easily clamp on stock A-arms and start working immediately on your first ride. They actually look kind of cool too. Price: $149.95.
Contact: http://grounded4.com or call (760) 722-FOUR.