ive seen quite a couple latinos supporting trump, theres various hashtags of minorities supporting trump. #twinks4trump, latinos4trump, etc. /r/rightwinglgbt is an example of right wing lgbt. there was even recently a prominent lgbt republician seeking change in her party. milo is another example of a popular lgbt trump supporter.
there are minorities who support trump because they appreciate him rooting for americans. they like hearing that. they know theyre a "true" american, a legal american. and that theyre only poor because illegal americans are taking their jobs. they simply seek to wish to remove them and increase their status. whether this is wrong morally or not is up to you but thats the general reasoning i see from them - they want americans first, and that includes them.
and yes, leftists never cared about rural whites. ever. its always been upper to mid class whites and city poor. the rural whites was a demographic generally touched by the religious so trump is onr of the recent ones to capitalize on this very big population and to win their support