</font><font color="blue" class="small">( So, you mean actuaaly filling the tires with something other than air? I never thought of that as a counter weight or "ballast" but if the tractor was going to be used for using the FEL to flip compost then also using a mower deck to mow at my brothers property ...then the easiest solution would be? I would think a weight in the back "ballast" that I could keep on for use at my house primarily to lift the horse and then something I could easily un-load to add a mower deck or to use the FEL? )</font>
Shawna, a ballast box, or a weight box, is exactly what it sounds like, it is a box, that you fill with rocks, concrete, sand, or whatever and they are used for exactly what you are describing. I don't know why, but they don't come with wheels on the bottom of them. I welded wheels on the bottom of my ballast box so I can slide it into the corner of my garage when not in use.
Ballast/liquid filled tires are also exactly what they sound like. Typically a solution like windshield wiper solvent, anti-freeze (which is poisonous if it leaks out) or any of several other solutions that resist freezing are loaded into the rear tires to add weight to the rear to balance the load when using your front end loader. The downside is you cannot easily remove the weight when you don't need it.
Wheel weights come in many forms, but typically they are semi-permanantly mounted to the wheels and held on with bolts. They are technically removable, but it is a real hassle to take off or put on 50# (or more) disks every time you want to lighten the load.
Foam Fill is very similar to liquid filled rear tires only instead of liquid, foam is injected into the rear tires. It hardens and the tire never goes flat. The only way to remove the tires is to cut them off. It is very heavy and many of us swear by it.
I have my Cub Cadet garden tractor tires foam filled.
I have a weight box for my NH which is a mowing tractor and also used for FEL work, I want to be able to easily remove extra weight when mowing if the ground is soft.
I have liquid fill on the Kubota which is basically used for FEL work, box blading, etc.
I have air fill on the Ventrac slope mower, but am considering foam filling those tires for puncture resistance more than adding weight.