I know nothing about Don't Come Knocking beyond the synopsis supplied by Sony Pictures Classics:
"When he was younger he was a movie star, mostly in Westerns. At the age of sixty, Howard uses drugs, alcohol and young girls to avoid the painful truth that there are only supporting roles left for him to play. After yet another night of debauchery in his trailer, Howard awakens in disgust to find that he is still alive, but that nobody in the world would have missed him if he had died."
"Howard gallops away on his movie horse in full cowboy regalia; fleeing from ... his life."
And it is a Road Movie.