Most ag tire manufacturers do not recommend liquid ballast in radial tires. I have two tractors with radials and liquid ballast, and one tractor with radials and wheel weights. All other tractors have bias rears with liquid ballast. I do not like liquid ballast in rear radials, it negates some of the positives of radials and has a very bouncy ride on the road, I suppose due to softer sidewalls and liquid movement.