Mine is 4 x 4 580K. It looks very top heavy, but is surprisingly stable. I put the downhill stabilizer 6" from the ground, and swing the hoe uphill. A big rock in the rear bucket gives a significant bit of stability. The front bucket full of dirt, carried just above the ground stabilizes nicely. Beet juice in tires is a great ballast that isn't so very corrosive, and won't poison your dog if it leaks. Then, if you still want, duals on the rear, that will let you work the side hills on Everest. If you can't buy spacers, any good fabricator can make them. Tire chains are a big help year round.
Willie