I'm just venting here. I work at a campground. It amazes me how people park their units on a site. We place poles on ground to help define the dividing line, so what do people do , they park their uni...
Why don't you print off a bunch of informational fliers that is given to each camper at time of check-in with a picture drawing of a camper with slides out inside the lines. This is non intrusive. Later, walk around the campground and tell offenders they need to move inside the lines. It's your campground. If they don't follow the guidelines, it's on you. You are the manager. Insist they move their camper when you see that.