[cvbanda]

I just installed mine in my 2720SL. I had to put a 1" PVC spacer board under my tank to get it to sit right in the tight space between the wheel well and the tub. This is the same material that is sold in Home centers for doing outside trim. I glued that board to my floor with construction adhesive and then screwed the tank to it with the supplied Sealand screws. Those screws are long enough to pass through the PVC board and into the floor. This adds and additional 1" height but seems really secure.

This isn't the easiest solution as you would have to disconnect your tank from its 3" drain pipe, temporarily remove the toilet, Install the spacer board(s), and re-install the toilet.