Beacon Marina by the Confort Inn
Spring Cove Marina
Holiday Day Inn Marina
Marina by Washburn's Boat Yard (can't remember the name of Marina)
Town Center Marina ( I think there is a name change for that one)
Rather than calling up and saying out right that you plan on living aboard, I would visit in person and let the marina know that you would be spending a lot of time on your boat during the winter. Play it by ear, and you may be surprised how many positive responses you get. A good full time person at a marina is a positive rather than a negative from the standpoint of security. Best of Luck.