2007 DODGE CHARGER User Comment / Complaint

Rear brakes on 2007 dodge charger (17144 mile, mainly hwy) grooved consistently from top to bottom. dealer checked and the only explanation they would give me was that i live on a gravel road and that rocks are causing this. apparently if you live or are going to drive on a gravel road you can't own a charger. both the dealer and chrysler customer service turned this down as a warranty item. dealer stated rotors needed to be turned but without giving me a solution as to preventing this problem in the future. the grooves in the rotor are about 1/8 of an inch. this would take about 40 rocks perfectly lined up on each of the rear brakes. impossible. i am be given the run around and would appreciate any assistance possible.