windshield washer fluid ballast long term issues?

I think I would go the route of antifreeze before window washer fluid, the only downside that I know of is if you got a big leak it would taint the ground for awhile. So if I was to do it do not put it in rotten tires and use tubes.

I do not know if you have a farmers co-op near by but ours does that service with a alcohol mix.

How about using RV antifreeze – it is safe and does not contaminate potable water systems. Buying in bulk would likely reduce the cost per gallon and is completely safe. Not sure on the corrosion aspects, though I would guess that it would be good.

  Beet juice (Rim Guard) is almost as heavy as calcium. I couldn't find anyone around here loading rim guard so I opted for rv55 over calcium. It's not as heavy but not corrosive either. I got calcium in the old Ford and had to replace a rim – it ate it up. After the fact a guy mentioned foam filling and said it was cheaper. I know they use to foam fill the mine equipment tires around here, could run them down to the cords. The foam is spongy like a super ball so the ride wasn't as bad as you might think. If he'd mentioned it before hand I would have seriously looked at that option.

  By the way the tire shop said with the loader not to load the fronts. They said with the loader there's enough weight stess on the front end components and not to add to it. 

have you tried to find cast iron wheel weights, both of my tractors came with those so I have never needed any fluid or the hassle that goes with it. but dealing with the wheel weights when you work on the tire is a another matter! I use a shop crane.