I would think that as long as the inner diameter of your waste hoses on your boat are comperable to your house's waste pipes, you wouldn't have much trouble at all with the house-style toilets. Problem sets in with people that use gobs of TP when cleaning up.
That is where the problem could be. Household sewage lines are usually 4 inch. Waste hoses on boats are 1 1/2.
1991 Pluckebaum 70'
13' Boston Whaler, 40hp Yamaha
10' AB rib, 25hp Suzuki (for sale)