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Steve, so obviously the tube is open at the bottom, in order to get convection flow through the tube when the sun heats it (which evaporates the dew). I have a similar larger foil insulation shroud for my CGX mount inside my observatory, which is boosted by a 25w incadescent light bulb to create a rising air column at night. I live next to the water as well and dew is a constant problem.
I would suggest you check your equipment at dawn before the sun hits the tube, i believe you will find it is still wet. The sun hitting the tube will eventually get rid of it, but that leaves alot of dark hours when it will be wet. I suggest you try a small bulb near the bottom of the tube to generate convection lift. This is an old trick that dob owners use to keep mirrors free of condensation when the scope is not in use.
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