Nobody can ever really "know", can they? I base my trust of Donald Trump on my own judgment, my familiarity with the man himself over many years, the policies he has espoused, and also the many trustworthy and staunchly conservative people who have thrown their support behind him: Jeff Sessions, Sarah Palin, Ben Carson, and many others.
Jeff Sessions' and Sarah Palin's conservative credentials, specifically, are impeccable.
So, taking the situation as a whole, and also seeing the naked opportunism which the 3 stooges engaged in on Friday night, my preference couldn't be more clear.
The people who simply want to dismiss Donald Trump as a "con-man" or a "huckster" are the ones who are incorrect. Donald Trump has been well respected as a businessman and private citizen for many decades, and I find it very hard to believe that he'd endure all of these vicious attacks and hatred, if he was insincere and just acting on a whim.
Ross Perot was similarly sincere back in the day, IMHO.
I sincerely believe that Donald Trump will pour every ounce of his energy into being a good President, and in shaking the Washington Establishment of both parties to their very cores.
At this point in American history, nothing is more important than obliterating the Washington status quo. Nothing.