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).
First, you need a truck. While a half-ton, like a Ford F-150, Ram 1500 or Chevy Silverado 1500, is enough to pull a fifth wheel, most people who spring for a trailer big enough to warrant a bed-mounted hitch will likely need at least a three-quarter-ton truck like a Ram 2500, Ford F-250 or Silverado HD.