i think a local would know that there are a ton of more secluded spots locally to dispose of a body personally. but would they be more revealing to the killer's identity? or was the killer pressed for time? he had to know she would be found there eventually. perhaps it was just convenient to scene of the crime, as if he was parked there with her.
still, the murderer had to have some knowledge of that spot and that it would provide enough seclusion for his purpose.
i think the truck stop angle is an important one. if she was a hitchhiker or prostitute, she could have been working the truck stop. and a trucker that regularly traveled the area, could have potentially known of the A & P as a place to find some things that offered more than the truck stop. that might be the right combination of familiarity and scenarios for princess doe to end up in the cemetery.
i have probably said this before in this thread, but i think the tigerlady case has the potential to be connected to this one, even though there is a significant amount of time between them.
NJ - NJ - Knowlton, 'Tiger Lady' WhtFem 47UFNJ, 17-19, tiger tattoo on calf, Oct'91