Tow Hitch And Harness

[jeannebeeny]

HI I am new to the forum and have a question regarding adding a class IV hitch to my GX470. In reading the various posts on towing, I am confused about what I need. My 2007 GX does will be towing a 3500lb trailer and I plan on installing a brake controller. I am going to order the Class IV hitch from Sewell, but I don't know which harness to order or even if I need the harness since it does have the tow package. I know somewhere in the posts therein lies my answer, but I can't find it! Please help a new owner who can't wait to pick up her GX this morning!