25 years ago, a neighbor was loading a 450 Case dozer on his trailer behind the 5 yd dump truck. The whole shebang was on about a nine degree down slope. As he rolled on the trailer, the trailer pivoted around the axles and lifted the back of the dump truck off the ground. No parking brakes on the front wheels of the truck, so the whole thing started rolling back down the hill. He eventually rolled off the side of the road and the dozer rolled to the left and trapped his left arm under the ROPS structure. Lost the arm. So don't load on a slope, I would have never thought this could happen, until it did.
Your 2500 is not much to tow a hoe and trailer. I moved a 9,000 lb fifth wheel trailer with a 2500, and that was an accident waiting to happed. Only reason I got the job was the guy that already had the job wouldn't do it. I was hungry for a job, so I did. But I really took my time on down grades, put on the flashers, stick it in first and roll 20mph on the freeway. Your tail weighs twice what the dog does....