DId this boat come from a freshwater area? Does it actually have electric over hydraulic brakes instead of regular electric drum brakes? Because if the boat was going to be used in salt water, I can't imagine anyone putting 3 sets of electric drum brakes on a boat being used that way. They will just not last, standard electric brakes backing plates and shoes are not galvanized and will have a very short life in salt water if you are launching weekly. If you are in an area with hills, and do high speed towing electric hydraulic disc brakes (preferably stainless steel for salt water use) are the best set up. If you tow at low speeds and on flat roads, then surge brakes can work well and are cheaper. But even with disc brakes, if they are not stainless steel including the rotors, you will have significant corrosion issues with this frequent use in salt water.