Trac-Lok wasn't even an option online when I bought in April. It started being included right after. It was an option very early on as well, but not common.Trac-Loc became standard with Max-Tow around Jan. / Feb. 2020 on order dates with a slightly higher charge for Max-Tow option. But could be in some prior as a option at some times maybe?? But it can change with FCA. It was one of reasons I planned on ordering but broke down and ended up with a dealership swap with out it.