I could be completely wrong on this, but this is what I see as logical.
I do not think they knew each other. I do not believe he was a driver for any company. I agree with the person that stated the possibility of the suspect having informed her of some accident. For instance, he was an undercover detective temporary tasked with informing those at certain stops that their bus was in an accident. He could have graciously offered her a ride to where she was going. I don't think it would have taken as much as some might think to lure her into that vehicle.
Although I've been wrong about this before, I believe officers know precisely who they're looking for. I do think, though, that something is impeding the investigation. The car is rare, the state is rarer, white man driving it rarer, etc. All they'd have to do is get one of those witnesses (or the witness, depending on how many encounters there were with other females) to form a sketch of the suspect. Combining all that, I don't think it would be incredibly difficult to know who was driving that vehicle. At least to me, the question is- why has that person not been taken into custody? A sketch and a vehicle on a suspect with a small amount of criminal history is enough to apprehend, isn't it? So, again, why is he not in custody?
My main questions:
1. Is he evading LE?
2. Has he left the country and they are trying to find her first?
3. Did he kill himself?
4. What names might he be known by?
5. More prominently, did he provide an alibi that LE is currently trying to debunk?
Part of me wants to say he's done it before but this was an incredibly ignorant move. On video, in a rare car, seemingly little put forward to obstruct their face, and having encountered other females in a similar area. I personally would say, no, he's probably not done this before. I think it's more likely, if there's any violent background, it was in regards to children. And even if there were, he would have likely waved his right to refuse search and seizure.
In other words... Gosh. I just don't know.