I pull a Truax grass drill with my m 6800 Kubota. It's really heavy, probably 4000 lbs. ( I attached it to a three point hitch on a 90 horse Kubota and it lifted my front wheels off the ground.). But I don't use it in the 3 point mode, but rather with a draw bar as you stated. With the draw bar, it's no problem at all, more like pulling a trailer. The resistance with the hydraulics down and coulters engaging the soil is very minimal. I guess in really muddy or loose soil, you could bog down, but you probably wouldn't plant in those conditions anyway. Or on steep hills, it could get away from you. But in normal conditions, it should be really simple. It's not like pulling a disc harrow, but more like a trailer.
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