Flush King will help, but it depends on how many bends your discharge piping has. I had one for my old toy hauler, but with two 90 degree bends, it really was of limited use. The incoming spray from the nozzle just backed up against a wall of water after a couple of gallons. If it's a straight shot, would work better.
2006 Jayco Seneca 34SS
2006 Jeep Wrangler Unlimited Rubicon Toad