My 72 D200 is disc. I haven't towed a lot, but when I did, the factory stuff was fine. I didn't have trailer brakes either.

1949 International KB-2 "Mater" - 302/T5

1968 Dodge Dart GTS "The Drat" - 340/727

2006 Dodge Magnum R/T - Hemi

2016 Dodge Durango Limited - 3.6