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).
A typical barge can carry up to 1,500 tons of cargo. Today, most barges carry heavy or bulky items that would be difficult to transport any other way. Some typical items you might find on barges include coal, grain, oil, chemicals, trash, recyclable materials, sand, gravel, timber, iron ore and other minerals.