I installed the board. I split it in half and put a butt plate over the seam after installation. When I have the black tank box anchored in the frame there isn't any play. when I dropped the box. It had a little give. I think that is from cutting it down the middle. Iwould like to hear what other people experiences have been when they put the bathroom floor in with two halves using 3/4 inch plywood. I think it works well. So if I am happy that is all that matters.
Check out the pics from clicking on to this link.
The start of 73 Overlander restoration
SIU Bound
Brian