You should be able to do both, there are plenty of 8 wheeler tippers out there with hiabs on. the Volvo I drive has 3 pipes from the hydraulic tank with a flow valve. 1 pipe for tippers and the other 2 for walking floors that require a return. Shouldnt be too difficult for a wet pack fitter to set you up.
Edited to add… both systems run through the same PTO.