I did add a clear plastic elbow to the pump so I could tell what was happening at the pump. making sure liquid is there, and how clean the tanks are. I might add another knife valve at the pump attachment so that in case the pump stops working I won't have quite as big a mess to deal with. Gravity brings the liquids from the tanks to the pump, so if there is a problem, the valve can be closed at the pump so you can work on it or have another plan.
One big thing is to not put anything but water, human waste, and toilet paper in the tank. Tell the wife and kids nothing else goes into the tank as the pump will not chew it up. You will need to use the knife valve to stop the flow from the tanks and fix the pump.
Just like the 3" sewer hose, dump the black tank first and then rinse with the gray tanks. get the water out of the hoses, screw on the caps, and put it all away for the next time.