re: #25 William Lewis

Found at equus magazine:
“U.S. Army specifications for pack mules state that ‘American mules can carry up to 20 percent of their body weight (150 to 300 pounds) for 15 to 20 miles per day in mountains,’” Wickler says. “There are some anecdotal reports of 350 to 400 pounds and even an 1867 reference to 600 to 800 pounds for mules.”
equusmagazine.com

A half-horse can do more than a whole horse!