My 2000 expedition has about 145K on it and has the original shocks. I really have not noticed that the ride is bad. Tires are waring ok. I just replaced them and got 70K on them they were to the ware bars evenly. I am just thinking. The shocks are now 10 plus years old with 145K. Replace them on principal? If I do I will probably go get another from ford as the original have lasted really well.
On a side note: This truck is a bit odd. I got it used from ford. It was a ford fleet vehicle used by ford in Michigan to hall executives around in for the first 4 years of its life. I got it from a ford dealer that purchased it from ford in Michigan. I was told by the dealer that it was a bit of an odd duck as it had alot of heavy duty parts in it that were normally found on half ton trucks (250's). But it is all there in the build code from the factory. They told me that Expeditions should come with a basic F150 drive line. The truck sits about 3 inches higher than other "normal" Expeditions. I was told that the towing package was also installed by ford from the factory but that would not account for the half ton drive line. I have never seen another one like this.

