Another excellent product along the lines of macerator pumps is the sewer solution.
I have used mine for 2 years now, and am very pleased with it.
It pumps the waste via a water jet, up to 30 feet with the hoses included, and up to 100 feet when 1in pvc pipe is inserted, on relatively level ground.
It, too has a provision to flush the tanks. It is much cleaner and less bulky than the 3" dump hose.
It is not in the league of an electric macerator pump, but is an excellent solution for those that don't want the expense.