I owned a truck just like this about 8 years ago. Truck was nice and clean, new paint, new dump Godwin dump body.
The truck spec was the problem. The truck didn't have air brakes, 366 gas motor, auto. The truck couldn't pull a skid steer trailer with skid steer on it. NO power. We installed a 502 gas engine, better, but the brakes wouldn't stop the truck when full.
Make sure the truck is not to small for what you need. That truck was the biggest waist of money for me since we started.