I had just replaced my shocks on my 91 Royale at 67,000 Mi to cure side leans on corners and some porpusing. My newest 2000 Liberty may be showing signs of needing them at 60,000 Mi.. On our last trip down I70 which is a horrible road in Utah it catapulted its way down the road. It does not have any bad traits on normal roads but I'm looking for a consensus of when we need to think about changing shocks. Any thoughts?