Many Fire Department operate a Dock housing a Fireboat and Rescue boats together at the same station. Why not change the Docks to house both rescue and fireboats? You can keep the training ( SWR and Oceanic ) for their assigned boats or they can choose to train the staff for both making them attend both classes.
Some Fire Departments house Engines, Trucks, Chief's etc at the same station dock as their Fireboat/rescue boat. Why not make the dock station available to house land companies.