Speaking of the Bimini, how fast can I go with it deployed?

As fast as your boat can go, IF, and this is a huge IF, you have all the mounts, and fasteners tight. The Bimini should be tight as a drum, if it’s loose in any way, it will flap, and eventually destroy itself. Either way, it’s recommended to fold it down, or remove the canvas when towing at highway speeds.