I don't know the answer off-hand, but if LE was right when they told the VI that the photos show that RT & BT were where and when RT said, and if that would be at Kelbaker/Hidden Hill, then I'd be more worried about what time that was ad where he might've gone after the stop at the Circle K.
If on the other hand LE was mistaken or fibbing about when/where the photos were taken, for instance, if the time/date stamps had been altered, and if BT didn't show up in any surveillance photo at the Circle K/Chevron station or the Red Roof Inn across the street, then similar to what you suggest, I'd be more concerned about where they were before the stop for ice.
Another factor is time -- what time they left Bullhead City and when RT was seen at the Circle K. If there was little extra time between those two points (given their likely maximum speed pulling the RV), I would again tend to focus on what happened after the stop for ice and before RT called 911....