It seemed like a good fit, handled it well. I was used to the smaller one he had, when the oats were ready, was time to learn this one, we either ran to the tandem mack sileage/grain body, or just filled it to take back to the yard, it towed over the road just fine. I had to get used to the remote levers on the 4440 though.
This field, the one with one end that a bunch of grass grew in the crop,
was on the back side of a steep hill and there was no problem empty or loaded, 4440 was heavy enough. He used it for years hauling corn from the combine, same tractor, maybe the duals on for flotation as I recall The 6620 combine had oversize tires and a 7000 series rear axle, so I'll bet he kept the wagon out of the soft areas, or had the combine go to it, given it seemed ok in softer areas, saturated it would sink in but good, happened once at my place. I'm thinking he'd have put larger ones on if needed, like the 6620, (though they were easy on it concerned about the axles with the larger tires).
The smaller one, we sometimes pulled with his old 620, now that was ok, but the same hill, I was actually afraid to run that arrangement up there with a load of fertilizer on. I was not sure I knew the 620 well enough to know what gear to use, stall that out, its not going to end well at all. I think it was just before he could do the brakes on it, so they were questionable. We had a B way back when, so I was familiar with those at least, but knew better than to try something like this, his son grew up on that 620 so I asked him to take it over and up the hill due to the previous, no problem at all. He sure could back a haywagon with it as well.