I guess they could have anticipated want what originally happened to stick. They were reported missing, speculated to be dead, perhaps even victims connected to Chynna and Lucas. We all did go there when they first were just missing. If they were not seen later in the RAV4, who knows if they would have been labeled as suspects. Just a thought.
I'm not sure how they were spotted in Saskatchewan, unless LD had been ID'ed sooner than we knew and therefore his car was also issued a bolo/apb.
If they had stayed ahead of that and perhaps even taken another vehicle sooner, they maybe could have stayed out of the limelight of suspicion. Only other things I can come up with is there was a mechanical issue with their own vehicle, or it cost too must to fill up at the tank. ALL JMO