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).
That model can also haul up to 5,817 pounds in the bed. The best model for conventional towing would be the same truck but in the Crew Cab body style. That model can tow up to 19,600 pounds or a still impressive 22,600 pounds with a fifth wheel. Payload is rated 5,205 pounds.