When my boat is loaded on the trailer the bow is slightly off-center on the bow roller, to the port side. The bow is essentially resting on the port side of the center section of the bow roller. Is there a known process to assess which bunk may need to move in order to get the bow to center on the roller? The upright that holds the roller is straight (or appears so based on the naked eye), so I'm assuming one or more of the bunks shifted at some point, somehow. Thanks for any suggestions.