Re: Extension cords @ dock
Something to consider. The marina's around here have 30 amp power poles. You can get a pigtail from reputable outfits that have a 30 Amp twist in connector for the power pole on one end and a regular female plug that accepts a 15 amp cord on the other. The problem with this is that if you plug in a cord and appliances that are rated at less than 15 amp they'll get no protection from the circuit breaker on the dock's power pole, which won't trip until 30+amps.
I have lower than 30 amp on board AC circuits, but the cord to the power pole is rated for 30 amps up to the boat and I have lower amp AC circuit breakers on board after that.