I like having adjustable ballast, so that I'm not running all over with max ballast on the 3-point at all times. I bought a Deere ballast box, Vevor would probably be fine too, filled it with concrete and welded my own carrying bars to the thing for carrying suitcase weights.
A few things, if you go this route:
1. Add some provision to attach a trailering hitch. You will hate yourself later, if you need to remove the ballast every time you want to tow a small trailer or log splitter around the yard.
2. Outfit the thing to carry your chainsaw, logging chains, rakes, shovels, water bottle... whatever you need while using the tractor. My ballast box is always loaded with logging chains, rakes, shovel, cant hook, etc.
Mine was already filled with concrete for use with a smaller tractor, when I got a bigger tractor and decided to add the provision for the suitcase weights. So I got to do the fun routine of working on a box already filled with concrete:
Finished product works pretty well:
I can carry 17 suitcase weights, and since the weights I own are the 42 lb. variety, that adds an additional 714 lb. to the original 750 lb. box-o-concrete, for a total 1500 lb. of ballast for those occasions when I'm lifting near max weight on the loader.
90% of the time, I have between zero and four suitcase weights on the thing, for scooting around the yard with
some ballast (750 - 900 lb.), but not max weight. I also have the rear tires filled.
Note that, depending on brand and design, you might need to re-inforce the pins to add all of these extra suitcase weights. The Deere box was already designed to carry a large box extension, near the weight of my suitcases, so the pins were already made strong enough to carry near 1200 lb. I'm a little beyond that when I install all 17 suitcases, but not frequently, and not by so much as to likely exceed their design margin. I've also amplified the effect of any weight added to the lower suitcase bar, by hanging it far off the back of the box, meaning I get more weight reduction on the front axle per pound of ballast than one would get through adding it inside the box.