This is a pretty good idea, but the sound can travel. Most people will hear it on the passenger side, but it can be prevalent around the driver side at times as well. The sound really isn't like a rattle, it more sounds like a small crack of plastic or something like a blown speaker pop/crack.
Hey all, just want to add on here to the team. Literally just got my Maverick last week. The week I bought it it was over 60 degrees outside and didn't hear it. Started getting colder and now I hear it pretty frequently. Seems less when I'm at speed, but that could be from the cabin heating up...