Only problems.1. The main unit is powered by a cheap screw-tipped cigarette lighter plug. If you don't check the tip every time, it will come off and you'll lose the metal tip. There is a fuse inside, but the book doesn't say which one to use, just what the car needs for the outlet.2. The transmitter unit must be hardwired. WHY? The brake lights are powered by the tractor and not the boat, so there's no good reason to hardwire them to the vehicle.3. Why use a transmitter at all? You alreadyβ¦