No on the disc. Hard stop. If you do some looking around, you’ll see recommendations of 5 to 10 hp per foot of disc. The TN 65 has 48 drawbar hp. On top of that, the tractor doesn’t have the weight. Fully ballasted it specs out at 5700 pounds. You would be looking at an 8 foot disc tops in light soil. Modify all this if all you want to do is smooth out some already tilled fields. Not if you want it for primary tillage. As far as the planter, are you talking no till or standard drill? My 6 foot no till weighs about 4000 pounds. I pull it with 100 hp tractor but could get away with a heavy 6000 pound tractor. So it all depends. Brush hogs don’t suck up that much horsepower so you should be fine, and with the tiller, just go slow. I’m pretty sure I would want creeper gear. It sounds like you plan to do some farming. I think you would do well to look at a farm tractor. In the new Holland lineup, I would be looking at a workmaster 75 or a power star 75. Would do everything that you listed and would not beat it to death.