I have pulled an 11' tri-wing finish mower behind mine with no problem. I also have a 72" finish mower I pull behind when I am mowing a smaller area. The ck30 handles both well. Granted I wouldn't want to mow 8" grass with the 11' mower. A couple of things I have found: Rear discharge is essential as you get into the larger mowers. They don't have to push the grass all the way across to one side through the remaining blades and therefore don't windrow and pull easier. Also, as you get into the larger decks they are more apt to scalp over uneven terrain since most have the wheels at the corners.
Personally, I like the rear mounted mowers since I can back under trees and trim fairly close that way as compared to a mmm. Also, I can quickly unhook from the tractor to use it for other things.