I thought about Old Spiral Hwy last night when I googled Holbrook Island. I agree though.
Bear with me a minute. Lets say that CC met RA at a bar here. I believe there is one close by Dynamart. They get into it, he does something and takes her in the SUV. He thinks he will be clever and store the car in the storage shed. (I am of course assuming it is one of the big ones on Warner) He does that, goes home, says he is going to sell the business and move to AZ.
RA is reported missing on the 19th. Between the time she is reported missing on Monday and when the suv is found on wednesday, wasn't it rumored that LE was trying to get a warrant for the storage shed? If so, CC could have went back to Lewiston, got the SUV and dumped it.
OR
same first scenario but he takes it up, cleans and details it, hears about the warrants or suspects it, then dumps the car.
IMOO