What else do I need to buy? We need to add something to our TV to allow the brakes on the pop up work when the TV slows and stops. We ordered this: Universal Installation Kit for Trailer Brake Controller - 7-Way RV and 4-Way Flat - 10 Gauge Wires through etrailer. My husband says I ordered the wrong thing. Can someone keep me out of the doghouse? We have a 4-way flat, but the Starcraft has a 7 pin. Husband is an electrician by trade and wants to do this himself. He said we need a "controller". Which one do we get? Thanks for ANY help!