Change slips to the other side of the bridge? Moving 600 gallons of water into bladders at 10gpm takes an hour. Emptying them will take at least half that time again. You have to do that twice to go under the bridge on the way to your sailing grounds, and to go under coming back to your slip. That's three hours, not including hauling these monsters from their stowage locations and back (twice!). Where are you going to store them? Are you sure you want a bigger boat?