The thread linked above has a lot of good info. It's worth reading. For a short answer, I installed the Torqlift hitch on my 2022 Model S LR, as well as a trailer light wiring harness, and I've had no issues with the USS, or anything else. By "tow mode," I assume you mean trailer mode, since tow mode would be for when your car is being towed. I have not found any need for a trailer mode. When you're backing up, the sensors will go a little crazy, but I find them easy to ignore. I always have Joe Mode turned on anyways, which is supposed to lower the volume of alerts. Not sure if that works for the USS alerts, but I don't mind them. Again, it's only when you're backing up. Trailer mode does have some affect on Autopilot features, and FSD, but I'm not exactly sure what. I would say if you use either, just be careful with the lane changes. It does not account for the additional length with the trailer and it will try to make lane changes where it shouldn't. If you use FSD, I would change the profile to Chill, and always choose "minimal lane changes for this trip."