How do I connect a trailer with trailer brakes to my 2007 Forester? I bought the tow package with the 07, but it only has a four-prong connector for brake lights and turn signals. The people selling me a pop-up tent trailer say I must have a 7-prong connector to connect the trailer's brakes to the Forester, but that Subaru must install it. When I went to Subaru, they said that the Forester was rated for 1000 pounds without trailer brakes and 2400 pounds with trailer brakes, but that they didn't sell or add the connectors to allow the car to tow the larger amount. What sort of "Catch 22" is this? They say it will tow 2400 pounds, but won't equip the car to do so. Now what should I do?