License plates from truck to TC and back again, and again.

I have never moved it from the truck, and never been questioned about it. Has anyone actually been pulled over solely because they hadn't moved the plate? Now, if you get pulled for speeding or something else, then it would be expected they would look around for other things. But I would like to hear from anyone that got pulled over and the only reason was their plate was obscured. I'm thinking it is about as common as getting pulled over for exceeding GVWR - and we know how often that happens!