I put some new Bilstein 4600's on my 19 Tahoe LT. It had about 120k and the ride difference was awesome, much more stable on the highway. Figured I might as well put some on the fronts and it was even better. So if you have over 100k, think about replacing your shocks with Bilsteins or equivalent. One of my rears was leaking and bad. Fronts did not have leakage but I'm sure they were soft. These were fairly simple as they were regular shocks, not magnaride or nivromats.