IMO I don't find it very unlikely. In fact, that's exactly what I recently started thinking may have happened. That there was supposed to be a hookup which is why he turned off Waze (no longer needed) and turned on SnapChat (so whatever was said/seen would disappear after so many seconds). SnapMap could have been used to get him to Point B. Maybe Point B was the road he was on, maybe it wasn't. But it really is an odd place to end up if everything was on the up and up.
I've also seen a few people (not here, nor is it anything I can discuss here) say things that make my above opinion likely. Something is is just not right with this case and it's hard to put your finger on it. We know he was planning on staying a while wherever it was he was going or he wouldn't have brought his fish with him. Not like it's a dog that loves going for car rides! lol His father admitted on the video that he hadn't said he was coming... I just think they believe that's where he likely was going. I still haven't seen any evidence that answers my question.... does he normally inform parents he is coming for long visits... or simply shows up? I'm guessing he'd tell them first but I could be wrong.