I've recently replaced the rear shocks on my 2013 Denali. The rear end was bouncing over bumps more than I thought was normal, and new shocks really helped out the rear. Now, naturally I feel like the front is worn out. Does anyone have experience as far as the strut mounts and if they should be replaced at 75k? I've seen in the past where some can be flattened or worn out on my previous cars...they were different setups obviously. I know that since I'll have it all apart anyway to just change them, but for $60 a piece I wondered if I could get by without changing them and only changing the struts. Thanks for any input.