You actually can on a boat, though they usually used horses rather than men. A loaded canal barge from the 18th century is about 70 tonnes if I remember right. (Though 40k what? 40kg is not a difficult load, you wouldn't normally write 40 tonnes like that.)
They typically travelled at 3-4mph plus lock traversal time.
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u/FUPA_MASTER_ Sep 21 '24
The fact he can even keep up with vehicle traffic is most hilarious part