I would have thought simple common sense would be the order of the day, I don't hold the theory of this PC world that all men are child molesters and rapists. Crime of this type is relatively rare compared with the past and any threat would be the same as faced by a couple wildcamping, eg drunk kids and youths.
Many here simply support the idea of simply parking in a position to pull off quickly without getting out the vehicle and link your front doors so they cannot be opened, making sure you can still operate leaving quickly routine. Simply sounding horns and lots of light will unnerve most!
Again, threats and problems are rare, more likely the attitude advertising anywhere, single afraid female may atract unwanted attention. Sounds like you have up together female, most males who approach in life and you deal with now will be no different what you meet on the road!