Squeaky suspension?

Ugh...my truck is at the dealer right now and they can't duplicate the sound. I took a video on Tuesday evening and sent it to them and it was absolutely screeching when I stood on the predator steps and rocked the truck. When I took it to the dealer yesterday morning, I couldn't duplicate the sound, and they haven't been able to duplicate it since.

My truck's warranty expires Monday. Any other suggestions, recommendations? Did you all notice it under certain conditions and not under others?

 

When I had that issue, would do it if air was damp, like early morning. When dry, I could rock the truck duplicate. Seemed to also happen a lot making slow turns over a bump, like turning into a drive way