I've had RVs both with and without macerator pumps. Initially I thought the macerator was a good idea, but now I'm having second thoughts. Besides things like hair getting tangled up in the mechanism, some waste tank chemicals break down the neoprene impeller in the pump. Replacing it isn't difficult, but it can be a real pain and might be messy depending on where the pump is located and the state of the tanks when the impeller gives out. My current RV has a SHURflo macerator. Most RV parts supply places charge an arm and leg for replacement units and parts. I've found most marine supply outfits offer the same units at sometimes 1/2 the price an RV parts house will charge. (BTW, SHURflow comes in both 12 and 24v with left or right discharge.)