Re: Another newbie question - need advice to tow a 33' boat, 6,000# tow
The trailer is a dual axle with electric surge brakes (brand new).
Electric surge brakes? There's no such thing. Possible braking systems are:
Hydraulic surge brakes - A master cylinder is located in the trailer coupler and is actuated whenever the trailer pushes on the tow vehicle. This generates hydraulic pressure which is used to apply the brakes. The brakes operate in a manner similar to those on your tow vehicle can be either drum or disc type.
Electric drum brakes - These use a magnet attached to a cam arm to actuate the brakes. The drum has a machined inner face which the magnet sticks to when energised. The resulting drag moves the cam arm and forces the shoes against the outside of the drum. Power is provided by a brake controller in the tow vehicle.
Electric over hydraulic - This system uses hydraulic brake hardware, but the brakes are actuated by an electric master cylinder powered by a brake controller.
Hydraulic surge brakes are the most common on boat trailers as the magnets and wiring connections on electric brakes are prone to corrosion, especially when launching in saltwater. They also require no equipment in the tow vehicle and are self-regulating - they harder the tow vehicle tries to stop, the harder the trailer brakes are applied. The trailer, however, still needs to push on the tow vehicle to apply the brakes. The braking system makes the trailer seem much lighter than it actually is, but braking performance will still be somewhat worse than without the trailer. The loss of stopping power is usually modest, but if you are pushing the limits of your tow vehicle it may become significant.
Electrically actuated braking systems do not require the trailer to push on the tow vehicle to generate maximum braking effort. With a good brake controller, these systems are better suited to heavy trailer / light tow vehicle combinations. They can also be manually actuated to stop trailers from swaying.
Electric over hydraulic systems combine the corrosion resistance/tolerance of hydraulic brakes with the control of electric, but cost more.