I have the first gen SuperCruise in a Cadillac and it works great. I have driven across Pennsylvania and only touched the steering wheel a few times to change lanes or interstate changes. During COVID I was driving 6-7 hours versus flying and it was very pleasant during and after driving. It will detect a vehicle in front of you, so you need to prepare to change lanes sooner, assuming you are not a left lane marauder, or keep your foot slightly on the gas at times or it will reduce your speed.
I didn't read you post you referenced, but it has sensors that track you eyes. If you look away for too long it will provide an alert. If you continue to look away, it will vibrate the seat and give an audible and visual warning that it is disengaging and to take the wheel. I don't think it will pull you over to the side of the road.
I can't speak to the towing functionality, but there are GMC and SuperCruise forums that may be able to provide more insight. Google is your friend. 🙂
In general I always thought that Ford was better at towing, but a lot will have to do with the rear end diff ratio. GM always seemed to put 3.23 axle ratios standard on their trucks. But I have not looked for a new truck for several years.