Seeing as no one saw them walking around the desert, it is possible that RT had arranged to meet someone there, isn't it? And that this third party was involved in whatever happened to Barbara? Their car/truck could have been parked across the road or anywhere nearby? What if he had arranged a meet for some kind of a deal - something went wrong, and the person/persons grabbed Barbara? Would that scenario work in line with his comments that she could have been taken and might be in Vegas? Thoughts?