Mine is 8' X24' and it moves a small amount by is pretty stable. I have store bought flotation that is rectangular shape ( also good for FHMs to spawn on). And I built in overkill into the floats
The "T" is 8X24
Pat did you buy the blue colored floats? A buddy of mine builds docks on Olin Lake in Kentucky and that is what they use. The Army Corp of Engineers dictate the materials and construction for Olin. He said they are around $100 each and can support a huge amount of weight.