I always tell people I am alone! First, no dummy or men's shoes outside your door is going to fool anyone. They will see YOU driving. They will also see YOU plugging in the electric and hooking up the water.
And second, especially in campgrounds, I think it is important to introduce yourself to your neighbors because if anything goes wrong--you get sick or someone bothers you--they will be watching. And frankly, in the four years I have been on the road, no one has ever bothered me, except the occasional kid who threw a ball too close to my rig. I tend to stay indoors because I work part-time online and have had neighbors come over to check on me because they did not see me outside. Had another neighbor recently offer their help to do anything I needed when they found out I was sick with the flu.
And finally, most people traveling in RVs are either families or older couples. Only on weekends in "party" places do you get groups of younger men or singles who are out to have "fun," and I stay away from those places.
I have invited many perfect strangers in to see my setup in my motorhome. I have even done that several times when I was parked on a street or at an attraction. It is always an older couple or someone with a child, not a single male. And I recently accepted an invitation to go out to dinner from a neighbor couple.
On the women rv forum, the big joke is about ax murderers. Most of our families worry about us talking to strangers or inviting them in, etc. because they might be ax murderers. We meet up with each other all over the country, which seems to bother some of our kids, and none of us has yet turned out to be an ax murderer, although one group did find an ax to include in their group photo!
The point is that there are very, very few ax murderers among us campers, and you need to remember that the vast, vast majority of people out there are helpful, not harmful.