I think the best policy is to load what fits safely, numbers take 2nd fiddle to that. Contained, 100 bales is a nice load for this truck, though I could go another tier or 2 higher, I just kept it level.
This one has hauled one of our tractors, worked fine for that, tying down was not possible with the racks in the way, so I chocked the wheels but good and locked the loader bucket cutting edge into the rear of the body at the steel frame, you can see that in the photo. Sure DOT may not have approved, and or no need to got there for the purpose of this post. I did run lowboy and know how to safely chain down very large pieces of equipment. I needed this tractor to get serviced and turned around quickly, only way to get it done was to haul it myself, and I did so, took the non highway roads, off peak to my house and dropped er off the next morning for service.
As you can see, there is a GM product in the background, an '80 K10, nicely rebuilt late 60's or early vintage 350, which I installed in 19 hours straight and drove home immediately after. What a long day, drove in on the old worn out motor friday morning and left early sat morning. The trans was an auto, I converted it to a 4 spd, 30,000 miles on the trans and drive train, all new universals, 270 gears though, still was a beast in low gear, and I have to say compared to the F150 next to it, one thing it did do better was traverse deep snow, and I tested that theory on the back hill here, went too far into the bank, could not back out, so I just went further in, kept at it, 24" of snow or about, might have been more as it was rubbing the rocker panels hard. Got all the way down the back hill and worked my way out around the old farmstead, at the time the NYSP barracks was still in use, the back side faced this field and when I got close, one of them came out and asked what the heck I was doing??? LOL ! I had to explain, he got a good laugh, was wondering what was going on as there were no tracks in, and me coming out. I had gone in where you could not see from there, had to clear some with the blade, but got out of it completely. She still sits in the same place and I need to finish some work on it.