I am looking to buy a small aliner trailer but discovered my Jeep just has a 4 pin connector on it. I will need a 7 pin for the type of trailer I am looking at. So I am wondering how much work and money is involved in getting that switched over? I had one shop quote me over $200 for the labor and wire kit. That sounds pretty high to me tho. My tow vehicle is a 2009 Jeep Liberty with rear wheel drive and tow package. Thanks!