Squealing noise acceleration

Hard to describe the sound accurately. But it sounds like a belt slipping or a bearing. It don't make this sound all the time on acceleration. You will have no doubt about the sound on acceleration. Very noticeable when it does do it. Last a couple of seconds usually at the lower end of the spectrum 3rd or 4th around that area at a steady acceleration. It's a sound that is hard mimic by voice. It was pretty good that this video (very short) caught the sound on his 2016. What I really enjoyed was when I told the check in service people if they had some one that could listen to the sound from the video first thing out of the check in person was "is it your truck in he video ?". I said no but that's the exact sound it makes. He said it don't matter not your truck so it's not the same sound until we hear it from yours. So there was a back and forth between me and him. It would have only took 4 seconds for them to hear it. That's when finally another check in person came and got the head mechanic, took it for a road test, didn't do it, we stopped on the entrance way to the freeway he pulls out his cell phone plays the video and said is this the sound ? Yup. Oh. Then the rest of the story. Ironic when he drove back on the freeway the vehicle did do it. Man, I got to stop I'm beating this thing to death ! Hate when I get like this.