Mules are slightly smaller than their horse parent, and when they grow they share traits of both a donkey (the long ears), and the horse (color, tail, etc.). A Mule in the grass.
For example, a 2014 Ford F-150 is considered a half ton truck but most variants can carry a lot more than 1,000 pounds in the bed. Since these terms are probably not going away any time soon, it's best just to think of them as smaller, mediumest, and more than medium.. (Pause for laughter).
The half-ton pickup's wheelbase was 108-inches and its cargo box was 6 1/2-feet long. The 3/4-ton's specs were 116-inch wheelbase and 7 1/2-foot cargo box. The one-ton included a 116-inch wheelbase and a 126-inch wheelbase with a 7 1/2- and 9-foot cargo box respectively.