Ifishnow, my experience with dump trucks hauling mud is money. You will have to keep the mud cleaned up so the dump truck can work, maybe requiring a dozer. The mud will want to stick in the bed of the truck so you will probably have to dig it out with something like a backhoe pretty often. Weight wise you can only haul about half as much mud compared to dry dirt. Mud=$.

Nick Jones
www.soilmovers.com