near all 4x4 trucks come with functional locking diffs/hubs.
Show me any standard 4X4 truck with a locking differential. I'll wait.
While you're struggling to find that information, I'll save you some trouble. Most trucks these days have Posi Traction. I don't know about Ford or Dodge, but GM doesn't even offer a locker. In fact here are the current GM RPO codes
Locking hubs are a thing of the past. Since the 80s and the common use of CVS GM has been using a geared collar to disconnect one side of the front differential.