Ok I will throw my 2 cents in. I have both loaded tires and a ballast box, here is why. I have 750 lbs on the 3pt. and with the loaded tires, it is about right to counterbalance what the loader will do. Now when I mow, on these extreme slopes we have around here I feel much better with the loaded tires, as it is a lot less tippy. I am not saying this is what everyone should do, but it is the right thing for me and my circumstances. As an another example, I keep the FEL on for when I mow, and back down some of these horrid slopes I need the weight in the front end to get back up with the mower on. Sure, a set of weights on the front would work, but I dont have any. Besides the FEL comes in handy while running the rotary cutter to push over brush and feel for rocks. Now if I was mowing on flatter better ground, then the FEL would be off for sure while mowing. What I would do is put on the ballast box, and see how things went, and if it was still tippy in the operations you want to do, then load the tires, That way you have not done anything (semi) permanent and can figure out how you should proceed.
James K0UA