Interesting. So I should err on the loose side? I've got them hand-tight (which I know can be vastly different depending on the hands), but I didn't go at them with a wrench.
Also after days of downpour I found that the roof leaks a little. Of course the previous owner said "roof doesn't leak at all". What I noticed is that the roof isn't even slightly convex, so some water pools when it really rains. I'll need to get at that asap. It's unusual for it to rain so much here. But I'll take it as a blessing. Without this kind of rain, it likely wouldn't have dripped inside the camper and would have just slowly caused rot in the ceiling that I wouldn't notice for years.