I had one of those Isuzu w3500s and it had plenty of power. I thought about using one of those trucks for this project but I can across this engine and I liked it so here we are again. I can put a belt driven pto pump on the engine. I have two trucks that run these and they do okay. I just keep belts in stock because they never break when its sunny or in the middle of the day.
I figure the motor would handle it but I am going to measure tomorrow for the 5.9 just in case.
Thanks
Brad