A 6x12 cargo trailer. class 3 hitch. I installed it myself and yes I have been towing trailers for 45 years. I have a commercial license. My concern is the car and it's capabilities. I'm aware of the maximum loading capacity and the car should handle it. One of my concerns is the transmission. Should I use the manual setting and keep it out of 5th? I'm driving from central Wyoming through Colorado to San Antonio. Lot's of mountain driving I've never towed with this vehicle so the concern. Thanks for the help George.