Just a query to see if any of you have replaced your shocks on a 4th Gen. truck, and, if so, at what mileage? If you did replace them, were the original shocks shot? On my 04.5 I replaced the factory shocks with Bilsteins at 22k and found the oem's were done. I have just over 26k on this 2012 and wondering if I should assume the oem's are toast and replace. Thanks in advance.