Re: 84\" rfm for tc29 or tc30?
I think it would depend on your terrain. My TC29D handles a 6' mower with no problem, even on hills. I can mow some pretty thick grass in mid range and full speed on the hydro pedal on level ground or slight inclines. But, it will not maintain full PTO speed on a long uphill grade unless I back off on the hydro pedal. Also, the balance is good and I can go up a 20 degree hill without the front coming up (I don't have a FEL and I have 2 of the small weights on the front, which I think is about 75lb). I'm sure a 84" mower would require much more weight to balance. On flat ground you should have the power, but hill might be a problem.