Powered Sewer Hoses and Sewer storage tanks

[cattfuu]

I was a bit hesitant to start this new thread as a 'newbie' and thank everyone for sharing. However, I wonder whether those that have this system in their Marathon know whether the additional space needed to install this system retroactively in a pre-2004 bus would require removal and downsizing of fresh, gray and black tanks?
I think these systems became standard with 2004 Marathons and younger.