Whats that horror movie?

its about two guys going somewhere to visit the first guy's girlfriend the two guys pick up this hot hitch hiker chick then this pyscho in this huge truck tries running them over becuz the guys friend pissed in the pyschos truck then the guys find out that the chick is related to the monter pycho then at the end the chick dies the two guys run the pyscho over with his own truck blah blah blah in the morning their still running him over then goes on to getting the guy's girl