I fill mine with what fits in a 55 gallon drum and the local tire dealer comes with 2 ea. 50 gallon drums. Tire size determines fill level. Mine may slosh going down the road but I can't tell it. I do notice that if I do a quick stop I can feel the tractor rocking back and forth for a minute. I have both and I have access to antifreeze. I don't necessarily have access to wheel weights.
Works for me.