Black and gray tank removal/replacement

[cannonball39]

Hi all. We have removed the pan with the black and gray water tanks. Our black Thetford valve was leaking so we decided to take everything down so we could do a nice job cutting an access panel into the pan. This is the second time we have had to do this, so enough is enough!!! My question is on our gray water tank is sitting up in the air in the pan and is only being supported by the Thetford valve. What am I missing??.

1997 Excella Classic 34’