Ron, I had a problem with the mounting of the macerator pump. It was supported on the exterior side with a large U clamp in a manner that caused undue pressure on the bayonet fitting on the input side. Vibration from normal driving and mileage caused a leak at that point.
I altered the U clamp so the alignment was proper and as opposed to replacing the fittings, I simply used Dycor to seal the leak after cleaning the area thoroughly before applying. That was about 20,000 miles ago and it hasn't leaked since. Now, that's a low tech lazy solution to a simple problem that should never have occurred and would not have happened if the clamp had been placed correctly during construction. It didn't take but less than a quarter of an inch out of alignment to cause the problem.
I have had those outside showers on several rigs over the years and my record is perfect: I have never used one and only acknowledge its presence when winterizing and dewinterizing.
Steve, your ladder and one foot on the hood says a lot about your balance and the faith you have in your wife holding the ladder!