This falls into the grindhouse genre, specifically of the ilk where horrible stuff just happens. The plot synopsis is pretty horrific, and not in a "skeleton monster hunts down people and wears their flesh." It's horrifying in a very real way. It's about a guy who lives with his mother (red flags already). His sister ran away years ago, throwing his mother into a depression, so one day while he's driving, he spots a female hitchhiker. He goes into psychosis thinking she's Judy, so he rapes and kills her. Then he just keeps doing that.
I have a hard time with these movies because there is never a point to them. Violence can be excellent when there is a point to the violence. I really doubt 'Hitchhike to Hell' has anything interesting to say about the human condition.