You know I'm biased, but am really trying to evaluate if she would be a net positive or negative. I can't think of another candidate that would be more of a net positive. First of all, she's a woman and counters Hillary's woman card not to mention she's a stark contrast to Hillary.
Who would help get more votes? That's the key question. I still think she would help with the woman and blue-collar vote - and across the aisle with women, union guys and millennial women fed up with Hillary or Bernie supporters who dislike Hillary. A number of them wouldn't vote for Trump and a guy VP - if on the fence, might hold their nose and vote for Hillary by default - But they might vote for Trump and Sarah Palin.
Just trying to do the math here and I think Sarah Palin would help the most out of the five Carson mentioned. Might make the difference in the swing states.
Trump has had a lot of media saying he is not Presidential and Sarah has had the same tag “not sophisticated enough”. Both together would not help Trump. IMHO If he picked Newt, I think Newt would bring a solid person with experience and would help Trump. Newt being considered the adult in the room. I think a Trump/Sarah ticket would be laughed at.