We have a macerator pump too and I use both depending on the situation. Once I let the air out of the bags on the chassis and depending how much leveling the coach needs, sometimes we have a low clearance under the sewer opening.
Sometimes I can't use my slinky caterpillar stand as it won't fit under the slinky hose as it exits the bottom of the wet bay. Also, I usually never rinse my slinky. I let the grey water rushing through it do the job and in 6.5 yrs., no real problem with it.
I make sure I have an almost full grey tank when it's time to empty the black tank. Once we do a couple of loads of laundry, a couple of showers, run the dishwasher, it doesn't take long for the 70 gallon grey tank to fill up. I might empty the grey tank two or three times before I empty the 40 gallon black tank. But whenever the black tank needs to be emptied, the grey tank is near full to rinse out the slinky.
Our toilet is a macerator toilet too, so, everything that comes out of the black tank looks like confetti anyway.
MM.