Overnight docks
There are some marina based transient docks--or at least there used to be--municipal docks could follow that model, charging a fee. Mostly they sent a police car around in the middle of the night to see that nobody is there. No big deal to have them check for a flag or other tag that shows they paid a fee. Most towns already have restrooms near the docks, so that shouldn't be an issue. Of course, a "houseboat" would already have a state inspection sticker for their plumbing facility.
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