Fluid in a tire makes a world of difference. I live a half mile off the highway, and have a gravel road for my driveway. I keep it graded with a 7 foot box blade about every 6 weeks. For a short time, I had a Kubota 4210 4-WD, no fluid in the tires. My drive has a couple of inclines, and the tractor would spin out if there was too much gravel in the box, even in 4-WD, and full throttle. I traded for it a 45 HP New Holland, 4-WD, with fluid in the rears. I can grade the road, half throttle, as much gravel in the box as it can hold, and never spin. I've ran farm equipment for over 50 years, and those rear tires on a tractor of any size, must have some added weight if you want any traction at all. Mine has calcium chloride in them, but a local store is selling Rim Guard, and I'll take a look at it if I ever have to replace the fluid in one.
