No and no. Consider: there is no common term "Black trash" (though I'm sure someone has said it somewhere). Why is that? Why would the white people who use the term "white trash" not have an equivalent term for Blacks? I'd posit that for those people look down on Blacks in general, so why would they need to add the word "trash" when it's implied? I may or may not be the only person here who has heard a White person say of or to a Black person that they're "one of the good ones." It's a very ugly relative of the term "white trash," and it states quite clearly the viewpoint of the speaker: most Black people are "bad," in all the ways that our country's racist stereotypes might suggest.
So for white people, we have "white trash."
For black people, we have "one of the good ones."
Do you see the difference there? Is the implicit racism of "white trash" now perhaps a little more apparent?