trimmerhead - I love the ezdumper. It's worth every penny.
Not sure if you want weight capacity or area, so i'll give you both.
Weight capacity of dumper itself is 3 tons I think. But, the truck can only handle 1.5 tons with dumper in it.
Dumper without sides will hold 2 cu. yds. With my sides on it will hold about 4.5 cu. yds.