I had a
B7800 and a
B3200 which I used a 6' RFM on. I first had a light weight cheap RFM on the
B7800 and the tractor handled it weight wise and power wise fine but the mowing deck kept breaking on my rough hill side property. Barlows gave me my full purchase price back for the cheap deck toward a 6' Landpride RFM. The Landpride was a tank. No more breaking of the deck.
There was one issue but it wasn't major. When I'd get to the bottom of the hill and make my turn the deck sort of swung the tractor instead of the tractor swinging the deck. It wasn't a problem since I knew it was going to do it, after the first time.

I Kept the deck and traded the
B7800 to a L3240HST. The
L3240 handled the deck like it wasn't there being about 1700 lbs heavier than the
B7800 (same weight and HP as the
B3200) but the
L3240 would run out of steam near the crest of my hill being 1700lbs heavier and about the same HP as the
B7800 and
B3200 with the 6' Landpride RFM. So, power wise the
B3200 will power a 6' for sure and probably the bigger one but if your on other than level to moderate rolling land you'll feel some deck swinging the tractor dynamics if you have a good heavy weight deck..