At about how many miles should the shocks be replaced on a 4X2? What has been some favorites of those who have already replaced them? And I'm talking about just the normal stuff, no slamming or lifting. What other suspension type stuff needs to be replaced due to wear?

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'97 f-150 XLT V6 auto 3.55 silver reg cab flareside , 6 cd, Lariat floor mats, tonneau, ground effects, tint, glasspack w/ duals, new= ion optics fog lights, cracked windshield (thanks to a dodge caravan). the heartbeat stops here.