Eno , I have a tufline 4 foot disc that I use here in Ga. The disc only weighs 256 lbs. But I modified mine with barbell weights. It now weighs approx 550 lbs. If I'm preping un disturbed ground I use a Fred Cain 3 shank chisel plow to break the crust. Then I use the disc or for lawn prep , I will use a tiller. I have a Befco T-30 34" tiller. the only reason I went with that size tiller is, The only one available at the time and it side shifts. But the disc works fine now that it's weighted down. The Bx pulls that thing fine. Also with a disc harrow speed helps with the cutting action. I also use a 4' pulverizer to smooth and prep lawns for sod or seed.