I didn't see this thread or I wouldn't have started my own.
I started noticing my Z71 equipped truck starting to handle a little sloppy but thought, hey only 20,000 miles and its a truck, what should I expect. But I was also getting nose dive on breaking
I hook my camper up to tow back from the dealer and every overpass was like riding a boat. I get the camper home, ride the truck around a a bit and realize I have no shocks! No rebound esp.
So I get shocks (not Ranchos) When I pull my old ones off, 3 of the 4 are having issues. 1 strut was leaking oil. 1 rear was leaking and wouldn't expand back when compress, the other rear, cavitation when compressing by hand sounded like a bulldog with a cold.
I will say this too, it really shouldn't impact performance, but I was also shocked at how rusty the shocks were.
I only had 20k miles on my 2015 and the most "off roading" was driving the wife to work in the snow.
Mine is only one case so that is not scientific but to have 3 bad shocks with different symptoms (more or less) in suck low mileage.