Rattle under dash under certain power loads

[davidm767]

I've developed a new slightly annoying rattling noise. The rattle (sounds almost like a cavating pump or trapped loose metal debris) occurs during acceleration at highway speeds and only around mid-pedal throttle application. Has anyone else experienced this? Its new to me (truck is 15 mo old and ~11k mi) and I started noticing it after I bought a new 5th wheel and towed it halfway across the US. Specifically it sounds like its coming under the driverside dash and/or forward of that. Its not something that will get me to bring the truck in for that specific reason, but if someone noticed and solved that problem I'd love to hear it. 

[revrnd]

Clear out your gloveboxes. I'd had an annoying rattle in the dash in my 2017. A couple of months ago I did this & it was a tire pressure gauge (not round) in the upper glovebox. There were only a couple of other items in it, so it allowed the gauge to move around/rattle. It wasn't constant either, just @ certain times.