A wonderful experience!!

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Ok… now you can have TWO boats ;)
A small swan-sailboat of the Elven variety, to sail the Anduin from its spring to Tol Brandir, and a large fishing-sailboat, available at Pelargir, to sail everything except the Anduin over the Rauros Falls.

There was a random bug in the initial add-on, and I had a HARD time finding it. Looks like I got it!