There is an awful lot of empty space out there.
The most telling thing for LE to look for is the rig with a toad. So if you are a perp, do you dump the trailer or the KIA?
I'd assume the perp wanted the trailer with the big Ford engine, so you'd dump the KIA. Far less conspicuous in a parking lot or something. I'd be checking parking lots west into California and east into Utah. North to Hawthorne and south into Vegas. That is what I would be looking for. Easy enough to put some stolen plates on it.
Likewise. Put a stolen or old plate on the trailer and it becomes very anonymous. If you do the google drive on a section between Hawthorne and Luning, you probably see 8-10 similar rigs. Not to splashy, but big, with a nice big engine.
The key is to break up the set to drive it out of the area.
( And this would likely mean more than one perp involved, and there should be a another abandoned or parked vehicle around the area where the Barkers were removed from their vehicle.)