Bruce

I have a little experience in trying to remove the grey water tank. My wife dropped her wedding ring down the bathroom sink and then flushed water down the drain.
I found it was not possible to easily remove the tank. The connection from the waste line in the TM floor to the tank is solvent welded.
BTW I was able to finally get the ring out by cutting the outside drain line close to the tank and sticking my finger in the tank and retrieving the ring. A 11/2" rubber connector patched the line back up.

Bruce