Mike- I thought the towing package was just an option package? I could be wrong. Back in 66’ it is to my understanding that the package was upgraded cooling, stronger rear axle and lower ratio.
The fact it was called “towing” was just a selling point as chrysler if they sold the trailer hitch and or trailer wiring… it was dealer add on. As for UTG. He has a lot of followers but it seems his research is sometimes little to none. Or his research is from the wrong sources. He uses a lot of filler words and sentences I assumed was to increase the length of his videos. His videos are pretty good quality so I will assume he has a crew of people but I don’t know the man. When I see his, “boomer chair.” I click off. lol!