I'm planning on building 2 floating docks (may decide to make them permanent in time, but we'll see) using plastic drums. One of the docks will simply be 3' x 8' while the other will jut out 8' to an 8' x 8' square. At least that's the plan. How many plastic drums (55 gallons) would I need to support each dock? Two on the larger and one on the smaller?
