There isn't much unique about a tag axle. It has wheels, brakes, bearings, etc. like any other axle. You might be able to get some more details if you could identify the brand of the axle itself - you probably need that to get parts anyway. It may be aFord axle, but more likely something else, since it was installed by Coachman rather than Ford.
2004 American Tradition; 2014 Buick LaCRosse
Homebase in the Ocala Nat'l Forest near Ocala, FL