So I have the opportunity to get a shallow water dock to leave my potoon in water over the summer. I measured the water at low tide and it is 18 inches. My pontoon water line is 16 inches at the back stern. Only 7 inches at bow. I an concerned that there will be times the back of my pontoon will rest on bottom. Should I worry? Is there anything I can put down on bottom seabed to protect tubes? Suggestions would be much appreciated! Ocean side of key largo has very shallow waters and long piers for docking. Bigger boats have the deeper docks all taken.