I keep 2 Hebb Electraglide 500 electric bicycles aboard. They're full-sized and don't fold, so I carry them atop my bridge deck using the boom and mast for hoisting. Up high, with a cover and at a cruising speed of only 7 knots, corrosion should be manageable.
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They're pricey, about $2000 each, but they'll each carry 50 lbs of groceries at 20 mph for 3 hours per charge. *I have large water-resistant saddlebags and a rack in back, a good-sized basket in front. No vehicle registration or insurance is required. They also pedal with 7 gear speeds. So payback (per bike) comes after avoiding 100 $20 cab rides, or 40 $50 car rentals.*
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I'm starting the Great Loop in the spring, *these bike should allow lots of cool off-boat explorations along the way. As a former avid motorcycle tourer, they also satisfy my need for 2-wheel speed.
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I tried folding bikes with 20" wheels first - agree with the clown-bike comment.
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Just my 400,000 cents
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Jeff Wolf
M/V Vagabond
Pilgrim 40
Currently in Thunderbolt, GA