People who live in Bullhead City, AZ, would be very unlikely to take their RV out to Kelbaker Road, CA, to "hike" in the middle of a heat wave. It doesn't add up. A lot of us from that area think he offed her somewhere else, and then drove over to Kelbaker. (Mojave National Preserve.) I bet where he hid her is far from Kelbaker.
There is a point of no return unremarked at the time in most lives. Graham Greene The Comedians
A clean house is a sign of a misspent life.