Ok. I wasn't sure. That IS odd!
I am tempted to try and bring up via satellite imagery, the Jamisons house the day they allegedly went to visit the mountain (the first visit.) Wonder where the truck was parked then. Also, there are several DOT cameras exiting Eufala and Red Oak. Seems like the dome light would help distinguish their truck from the other 50,000 white trucks in the area.
Also, wasn't there some mention of a security system in their home? Or do I have that wrong?