What is this squeak in my xterra?

Hi, I have a 2005 Nissan xterra with 6,900 miles on it. I bought the car new and right after I got it the squeak started.

It sounds like it is coming from under the car sort of in the middle. There is no ryme or reason to it. I hear it mostly when I am going around 20mph but that just be because the car is quieter at that speed. It seems to happen on slightly bumpy roads but the really big bumps I don’t hear it.The dealer has looked at it several times. They have adjusted the sway bars but the squeak came back. I just don’t know what to do but if I ever sell it the prspective buyer won’t go for the squeak.

Any suggestions I can ask the dealer to check?

Thanks, JJ

see my posting on my frontier, with nissan search word. forgot to mention I had the same year. Not sure if same chassis.