If you purchase in a manufactured home park you are probably about as safe as you can get. Keep some kind of heat on and hook up a light to a timer. Your bigger problem as mentioned is the dampness and salt air. Several years ago we built a house on the Oregon coast on which we installed a metal front door. Before we could finish the house the front door rusted through and the door handle fell off. Prior to that we had a mobile home on the coast. The first year we did not keep heat on and when we went down to use it had mushrooms growing in the carpet.