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Are they less rough?
My shocks on my 98 are still good, but that truck is stiff as hell. Hitting a bump on the road at speed makes the rear bounce. It has ever since it was new when my father in law bought it. I just bought it from him and I'm looking for something with a little more forgiveness of less than perfect roads.
That is pretty typical.
Your rear suspension is purposely built stiffer because it's designed to carry a heavy load, but if there's no load in it, it's going to bounce around more and be rougher. Different shocks could help somewhat with this though it likely won't smooth it out near as much as throwing a couple hundred lbs back there (sandbags, etc.) against the tailgate would.
Did your FIL put add-a-leafs or some other load-handling device on it?
If not, then it sounds to me like maybe the shocks are infact shot. They are close to 20 years old, and unlike some aftermarket shocks, they tend to be shorter-lived (a buddy's Ranger that was 6 years old when he bought it, the stock Motorcraft shocks that were on it were already toast).