How many tons can a 2007 mack granite CV 713 dump truck carry?

As much as it's legally rated for. You could be talking about a truck in any configuration... single axle, tandem, tri-axle, quad axle, quint axle, centipede, superdump, etc., or a tractor-trailer, then you get into various configurations there, including heavy haulers. You need to be a little more specific.