My feelings on Trump is that this is no accident. Everything he says and does is (more likely than not) scripted based on internal polling and a carefully crafted game plan. If he goes populist (at least as far as taxation goes) then they believe (and have the polling to back it up) that it will help him.
I mean, just look at his past stance on abortion and how he has identified more with Democrats in the past. He’s patching together a platform that resonates with a lot of (whacked out) people. He is, essentially, Frankenstein.