[QUOTE=BRENT in 10-uh-C;536079]
. . . at what point do we start worrying about cycle failures of rear axle shafts, or spindles, or steering components? 
We shouldn't beyond reasonable prudence. Life is too short. As we all know, there are two groups of vehicle owners- the users and the possession collectors. I know people with 4x4's that pull the sheets over their head and stay home when it snows an inch or two.