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).
Answer: Most 1/2 ton pickups, which include F150's and 1500's, can safely haul about 1 cubic yard. Because 1 cy weighs about a ton, that is their upper limit. 3/4 and 1 ton pick-up trucks tend to haul as much as they can hold, which can be up to 2 cubic yards.