Rusty Nail's Location?
How do Lewis and Fuller know that Rusty Nail is even in the same area as they are?
The guys play their prank on him, ask him to swing by the motel, but does Rusty ever give them his location? He could be... anywhere.
I don't know what the exact radius of a CB radio's signal is, but since the one trucker warns them of cops in Jamestown (Fuller states Jamestown is 40 miles away from where they are) they must reach quite a distance.