Mine is wireless.

In the trailer I have a 12V battery. (Needed it anyway) And a controller box. In the truck, there is a controller, which plugs into the cig lighter.

Now, I can use ANY truck to tow my trailer, as long as it has a hitch and light hook up.

The 12 volt batt supplies the braking force, it gets recharged off the running lights which must be on at all times.

Its very cool.

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Jake Gulick
CarriageHouse Motorsports
ITA 57 RX-7
New England Region
[email protected]