Hi
The one ton with metal pickup box came from factory with the tailgate as far as I know
The documentations shows it drawn with tailgate
All model tailgates are the same size for 47-53 range and I’m fairly sure were identical metal thickness and construction so any 1/2 ton tailgate will work for your 1 ton. (F*rd trucks of the same generation use a different size tailgate between 1/2 and 3/4 and up trucks so worrying about different tailgate sizes is understandable).
-s
