Banjo, Its called a 'brake controller' and the P3 is a good one. It measures the rate of deceleration of your tow vehicle, and applies a variable voltage to the brakes, so you have 'proportional' braking of your travel trailer. If you are lucky, your tow vehicle comes with a connector under the dash, you just plug the pigtail from the controller into this connector, connect your trailer pigtail and you are ready to go. There are two adjustments you need to make on the controller so you don't lock up the trailer wheels every time you stop, lots of info on you tube and this forum.
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Bill, Kathi and Zorro; '05 Beaver Patriot Thunder
2012 Sunnybrook Harmony 21FBS (SQEZINN)
2007 Jeep Grand Cherokee Overland
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