It doesn't make any difference to me when would be the best time to deploy the awning because it doesn't help me understand what happened to BT. JMO
It gives context. In fact, if the awning
was deployed, that supports RT's narrative. That's why it would have been good to get a BOLO out for Barbara right away and ask locals (especially from the southern side of Mojave NP) if they saw an RV parked there. Long shot, yes.
It supports RT's narrative because most couples would feel okay about one of them taking a 5 minute walk alone to a place that had shade. Even if the key had been disturbed or required getting down to look under the truck or was otherwise a bit difficult to grab, there would be shade.
If RT thought it was only a 5 minute walk or that he'd be only 2-3 minutes behind her, there's no reason for him to take the water out and have her carry it or drink some before setting out. If the awning was out and there were folding chairs, perhaps there was a bottle of water, too? Since he did not offer her the water or
insist on her taking the remainder of it, he surely thought she would be safe and comfortable at the RV. If the awning was already out, it would be much less hot than if they waited to get back and open it.
If it really wasn't open, then he used that detail to convince family that he had planned well and the fact that she didn't make it across the road (to safety) was not his fault.
There was little to no shade cast by the RV at that time of day (it was about 2 pm-ish, almost high noon by the sun). There would be maybe about 1-1.5' of shade right at the base of the vehicle, requiring a person to sit in the dirt, very close to the RV (and the RV would be reflecting heat onto the top of the person's head, IMO). To really get into shade (if she needed to), she'd have to lie down next to the RV. In her bikini. In the gravel and dirt.
The awning is, in this case, a safety and comfort thing. If he insists it was open, then he had every reason to believe that his own actions (dawdling, taking longer than 1-2 minutes putting away his gear) would not affect her much. She would have shade while she searched for the key. She would be cooling down already and could sit and rest her head if she was feeling dizzy (most desert people know to sit and put their head down if feeling dizzy).
If you don't believe RT in the first place, then it doesn't matter much, that's for sure. But at the time he included that detail (to family), it would have given family the idea that they were not acting irresponsibly in the desert, they had planned, and would come back to their RV safely. Like normal people.
If you believe him, then it's very strange indeed that she never got across the road. No sign of her travel cup. What would her reaction be to a slowing car? To smile? The abductor(s) would have to get out of the car to put her inside it. Did they simply pause and act like good Samaritans? Grab her and her cup and thrust her inside their vehicle?
Most of us would be very unhappy if a panel van or other larger vehicle stopped in the road in the desert, when we were alone (male or female). Since she would be pausing on the west side of Kelbaker, the car would either have to be going southbound or it would have had to cross lanes (very suspicious) to pull up alongside her. If, as some have claimed, Barbara knew about shady business dealings, would she not have been immediately startled? Even if she couldn't cry out, I think she would have turned and tried to run, dropping the cup.
If it was a sedan and the people acted like they were lost, then she would not flee. Most people would be very wary of a single man, especially a young one, pulling over while we were waiting by the side of a desert highway.
But he or they still would have had to get out of their car - a very frightening moment if she was trying to help them.
All of this had to take place within about 5 minutes or less (according to RT, he was practically right behind her - only a couple of minutes behind on a 5-10 minute walk). Barbara did not cry out, did not drop her cup (or if she did, these fast-thinking abductors picked it up).
It could have been just one person, but unless they pulled over from the northbound lane, the driver would have been away from Barbara and she'd have had some time to react if the lone driver got out in the middle of the road. Which is a really dumb thing for an abductor to do, given that cars go by every couple of minutes. I think that requires two people.
During all of this, RT heard nothing. He doesn't seem hearing impaired during his interviews, but it's hard to say.
Sorry for the length. Hopefully it's helpful for someone just joining (but I do think every clue is important until this case is solved).