8 cords 9 if your lucky
it depends on how big the dump truck is
It depends on the size of the dump truck.
How many liters a dump truck holds depends on the size of the bed of the truck. A small dump truck can hold about 1,024 liters.
That depends on the dimension of the dump body. The dump body could hold 15 - 20 cubic yards of material, typically. As for what can legally be hauled, it depends on the commodity and weight of the commodity per cubic yard, as well as state laws pertaining to what weight limits they allow for a tri-axle.
Concrete is measured in yards, not tons. As for permissible tonnage on a dump truck, it'll vary by state. IIRC, in North Carolina, a tri-axle dump is typically good for 16 - 18 tons, dependent on tare weight, wheelbase, and whether they're traveling on primary or secondary roads.
12 ton
Your dump truck will hold approximately 176 cubic yards. This can be calculated by multiplying the dimensions together (16 x 5.5 x 8 = 704) and then converting the result from cubic inches to cubic yards (704 / 46,656 = 0.0151).
17 tons
Dump truck specifications vary greatly- too much so for a "one size fits all" type of answer. A better idea of what type of dump truck, how many cubic yards the bed can hold, etc would be needed here.
25-28
Dump trucks typically don't haul liquid commodities, unless you're thinking of snow removal operations where they'll be outfitted with prewet or calcium chloride tanks. Even with that in mind, you need to remember that there are many different sizes of dump truck out there. 15 cubic yards is "typical" for a tandem axle dump truck.