I read online that front coil springs are something that usually never has to be replaced. Is that true? Me personally don't go off road at all. I do drive over 3 to 6 speed humps per day. I want to replace my front springs but I want to get the Bilstein 4600 for the front but Bilstein doesn't offer the coil over spring combo. Should I just replaced the front shocks only and continue using my original 2008 with almost 147k miles on the front coil springs?