I purchased 20 gallons of minus 20-degree wind shield washer fluid for $1/gallon at the end of winter at my local Walmart Store. That gave me about 80 lbs of
ballast in each rear tire of my JD 2305. I also bought a hose-end-adapter at Tractor Supply for $9 that screwed onto the tire valve stem (needle valve removed and tire jacked up to remove weight). Then used a small "water feature pump", a bucket, and a garden hose to fill each rear tire about 3/4 full. Simple, inexpensive, and a do it myself project for about $30. Dan C.