I feel your pain, and so do many others. Maybe if the victim was blonde, blue-eyed and from a well-heeled family the results may be different. As Dr. Locard once said, "Every contact leaves a trace". Lacking DNA, this case has, from the beginning, required a lot of old-fashioned gum-shoe investigative work. LE has proven time and again that they CAN IN FACT find needles in haystacks, yet NOTHING has come from a crime committed in a such a VERY SPECIFIC vehicle-type? We can land on Mars, but we can't find that truck? And, barring that a complete stranger committed this act, there is IN FACT a link between the killer and the victim. Never in my life have I more wanted to be a detective, and on this case specifically. This perp deserves to be cast down into the bowels of the most violent prison in America.
Maybe they need to take the reward money and use it to hire a first-class private investigator. Hell, I'd even reach out to a psychic. Has a LE criminal profile ever been done? Why hasn't the FBI Behavioral Science Unit been called in?