I have a power boat trailer and a company that can supply new brackets to convert it to a sailboat trailer for my Catalina 22 with swing keel. The boat is currently in the water and I can't take any measurements at the moment....does anyone know how far the swing keel, in the upright position, hangs below the boat? I need to know to order the proper height brackets that will allow room for trailer spring travel above the axles and the rear end of the trailer frame without hitting the keel.