How to transport cargo using boats in minecraft?
Solution 1:
In a way, but it's a bit of a fuss.
Donkey and mules can have a chest right clicked onto them in order to give them an accessible inventory:
Adult donkeys can't enter a boat, but they can enter a boat as an baby, then grow up while still inside the boat. So, what you'll need to do is make a baby donkey enter a boat:
Then wait for it to grow up and add a chest to it: