I am reading and following along from the beginning, however, this iPad has its own mind and may type at the speed IT wants to, or if I have to correct a letter, it may correct three entire lines! Consequently I am not posting frequently.
From the first day with BG being so overdressed compared to the light jackets the girls had on, my first thought was could he be a train hiker? Also, wearing a fanny pack is a bit unusual today, but a perfect way to carry his tools if mode of travel was jumping trains. This would explain how he got out of dodge so quickly.
My other thought is could he drive a truck that makes a delivery to a major store in the area weekly, like for Wal Mart? He drives the truck in, parks it, and leaves. The store unloads it, then he returns to pick up the empty cargo part. Meanwhile he has had the cab of the truck to drive around in, learn the area, and become familiar with any part that would suit his crime IF he is the monster killing young women.
I believe the WM markings are on the long part of the truck and not on the cab itself. Another advantage to where he would not stand out. JMO.
My opinions only.