Re: MACERATOR?
Yes, they are practical. There are built in ones, which might be expensive to install and may require maintenance. The one I have just turns onto the dump valve, around $200 on sale at Camping World, and no maintenance at all.
Down side is that it take a while longer to set it up (particularly if you dont have 20A of 12v handy to your sewer bay), and a bit longer to dump. But the advantages are a much better hose than the 3" normal hose, and the ability to pump longer distances or even uphill.