Do yourself a favor and order one of these while you are at it. Its a ball valve you put in series with the actuator and electric reverse solenoid. When you are hooked to the truck, the reverse solenoid works most of the time to disable the brakes while backing up, but at marina's, etc if they try to move your boat with a fork truck, there is no way you are moving the boat. The Kodiak brakes work too well. Just don't forget to set it back when you trailer it normal.
http://shop.easternmarine.com/index....4&categoryID=0