I need some info on the wiring details of my new Bee Trailer. The existing wiring on my 05' Dodge truck has a 4 wire harness. The new trailer has 5 wires. The one extra is obviously for the trailer brake. It has surge brakes. My question is; when I get the 5 wire harness for my truck will the extra wire hook to the reverse lights of my truck? The trailer has reverse lights, does this 12 volt signal for the trailer reverse dis-engage the surge braking mechanism? Or, is it more complicated than that?