Help with TV trailer wiring harness?

As mentioned you will not only need to install a 7 wire trailer plug, but figure out how to hook up your brake controller. Then there are the non electrical "tow package" items such as maybe larger radiator for HD cooling along with an extra transmission cooler and maybe even an oil cooler which might all be dependent on the particular make, model, and year of your TV. One potential $$$$ one might be the rear gearing to get you to the correct tow weight rating. Vehicle "tow packages" are generally more than just the electrical and even at times have different levels such as "standard" or "heavy duty" tow pkgs.

Thus to "upfit" a non tow pkg vehicle to one that has all the items in the factory pkg can get a tad bit pricey and might not be the simple "plug and play" that you might be envisioning.

Larry