A Combined 6335 Pounds of Trailer and Material are well under the 7000# GVW rating for a Cart-Away Concrete Trailer. A Cart-Away Mixing Trailer can hold 1.19 yards.
Some other brands add a steel water tank, a hydraulic pump and 30 gallons of water. This increases trailer weight and reduces the concrete carrying capacity.
Remember that you earn money from the carrying concrete in your trailer, not water!