The fact that the contents in her van looked to be rummaged through....could be staged. Also, what position was the driver's seat and rear view mirror in? Did the Police dust the rear view mirror and steering wheel for prints? Was the seat in the position Lorraine uses to drive?
I still say you need to start the search from the last place Lorraine was seen, and that was her home (seems to be a fair bit of bush out back).
I say that because it is being stressed that Lorraine would not step out of her vehicle (if she was by herself) at any time of day....then, in my opinion, it is unlikely she drove it to Lily Lk Rd and got out of her van.
Lily Lk Rd might be a busy road, but I doubt it was busy in the middle of the night. Also, at night, a perp could pay extra attention to vehicle lights in the vicinity, and be very aware of when another vehicle is coming from a distance.
I hope you get answers this spring.
Edited to add: Are the Police planning another search, or what is their position on Lorraine's disappearance?