The trailer connections changed on 2003 Yukons and suburbans midway through the year. I found this out when the pigtail for the brake controller didn't work, had to get a different one from prodigy. GM changed the pins in the place you plug the pigtail in.
On hard surfaces they will bind, unless it's the awd version. The outside wheel has to travel farther in a turn than the inside wheel. If it's fully locked it can't do that without something slipping. Be it the tires slipping on the ground or something slipping in your transfer case.
I use sea foam in some stuff, mostly lawn mower gas and occasionally in a ford tbird. Some one on another thread or maybe forum had done an experiment on different additives and came to the conclusion it was not good. But what happened to you, I don't think had any thing to do with the sea foam. Good luck, there was another couple threads Where others have had this happen.
I don't have one, but I did research it and will probably get it when a gooseneck trailer shows up. But after it's installed the normal backup is the default, then you select the chsml camera by touching the screen.
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