Optional Download: Philippe's version has even more boats and those boats travel long distances. It is experimental but worth a try, and it is up to date too.

With this mod you will meet some NPCs traveling with carriages on the roads.
There are also sail-boats on the river.
Currently there are three horse cart travelers, two ox or carabao (choose one) cart travelers, two boats out fishing and a Junk.
You can also see Lucy Swiftwind (once Mina), who is always in a hurry.

Useable! Yes, you can steal all the vehicles and use them for yourself as a mount.

There was a big problem with traveling boats and as long as it is not solvable, the sailors only wander in a large aria, out fishing.
If you like to try solving this problem, here is my traveling boat test-file: https://wt8g64050.homepage.t-online.de/nexus/npcboattest.zip

Also, all new NPCs and vehicles are essential. I often encountered the NPCs without the vehicles on the roads, so this was my decision.
I can only make two-wheel carriages. They do not fully adjust to slopes, so a longer carriage would look very odd, even on shallow slopes.