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 compact pickup truck can tow between 3,000 and 7,000 pounds, and most full-sized 1500-class trucks can tow between 5,000 and 10,000 pounds. Heavy-duty pickups can be configured to tow as much as 31,000 pounds.