We seem to have two topics going here so let me see if I can respond to both in kind:
1) Guests using our facilities:
Actual guests I don't have an issue with. In fact, at one yearly Halloween weekend camp my BIL and I have neighbouring sites, but it just happens to be on the cutoff for full hookups. I have full, he's just W/E. So, at that camp it's understood that both families use ours, for both black and grey water. No problems there.
Now if a stranger knocked on the door the answer would be no. But that only happened once at a provincial park. Tent camper a site over asked, but since we were next to the public facilities (just on the other side of our site) it was easy to say no and point out where they were.
2) Dump station etiquette/socialize:
We mostly use full hookups, but the few times we've been to a park with dump stations (like the above mentioned provincial park) there's usually some degree of common courtesy socializing going on between the people in front and the people behind. Basically, what I find at most dump stations, especially when there's a line up is:
A) while waiting next in line, you pull out your gear and place it close, but not in the way of the person currently dumping. Provide necessary small talk while doing so. This gets you prepped for when it's your turn.
B) after the person moves ahead, you pull up, hook up your gear and dump. During this time you again engage in small talk with the person behind who's setting out their gear like you did in step A. Also acknowledge the person in front who's pulling away.
C) as soon as your done dumping/quickly rinsing, you move your gear out of the way of the next person and then pull ahead.
D) engage in small talk when you return to get your gear, wishing them well on their journeys. Then return and stow your gear.
It seems to flow pretty well at the dump station doing this, as your minimizing the time at the dump itself by not holding people up getting your stuff ready and holding up again storing it all. But given the OP's story, now I'd be worried about somebody trying to use it while it's sitting out.
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