Towing question

[Explorer5.0]

I have to tow a 24' camper trailer, and I was wondering what kind of harness I need. The 6 pin or the 7 blade. I know a little about towing, but its my brother-in-laws camper and he knows nothing about the camper. Thanks

 

[je5]

The seventh pin is for 12 volt aux. power which you may not need. You can make yourself a conversion pigtail to keep in the dash.