Another thing I've noticed from the pro-Trump respondents is that IF they admit on the call to supporting Trump, many of them will repeatedly ask if this is private/confidential information, ask me to hide their name in the records, I had one tell me he's heavily armed and willing to defend himself if this information gets leaked.
I mean that last case was pretty extreme. I'm just saying on average, they do seem extremely concerned with people knowing they answered the way they did. Which lends a little bit of credibility to the shy Trump voter thing.
AGAIN, this is all anecdotal. But I make these calls every day.
In what states do you see this? I can assure you it's not the case in suburban Mississippi, much less the rural parts. I see way more Trump bumper stickers on cars that I ever saw for Romney, McCain, or even Bush, even as suburban Jackson has inched more Democratic (but basically the same) over the last 20 years.