I recently found what I believe to be the limit of my DL130 loader... I was digging out an old porch for a guy, and using my 42 inch Forks, I lifted out this slab of concrete.
Size is 4'x4'x10"... Now, a common method to weigh concrete is accounting for 150 pounds per cubic foot. That put this slab right around 2,000 pounds. However, when I flipped over the slab later, I discovered that it was not just a slab of concrete, it was also filled with large stones and bricks. So, I'm not sure if this makes it heavier or lighter than concrete, but I would suspect that it would be heavier because of the density of the stones and brick.
Anyhow, I could just barely get it off the ground, and once it was up the first couple inches it was easier to lift. But, I don't know if I could have lifted any heavier than that.
Pics:
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So, I think the tractor would easily handle a 1600 pound bale.
Regarding the tiller, my 1648 HST only has 36.5 PTO HP. With my property being heavy clay, I don't think I could handle a 7 foot tiller. So, I guess it depends on the type of soil that you are working.