Angled ones.
It will create red squares around the boat. (mostly in corners)
My gangways are ghosted but jetties are not so they will not fit
to the side of the boat
edit
correction - my gangways are not ghosted they will also be affected by
the red squares around an angled boat.
Bear with me .... just a second
@kid1293 just .... go with me on this for a minute, take a breath, then say "No"
What about, an invisible dock piece, that can reach to the middle of the river, with an angled boat.
The idea is that then the House Boats could be 'moving down stream', flowing with the river, and they have the visual effect of movement - but, of course they are built to the spot, and the invisible plank allows the Bannies to come & go from their homes as they need to

I know ... I have a 10 minute time out, and I need to sit on my hands. And yes, I know I'm in trouble.
Thank you, thank you all ...

ps:
@RedKetchup I thought I went through all the tents, I will have another play now whilst i'm in 'timeout' and will double check.

I was sure there were some, but I couldn't see them last night. So, not sure what's going on.
Unless I'm missing a mod?

!!!???