Not sure why you are asking. The base plates for a given model of toad mount in one place only - not height adjustable in any way I know of. If the toad height is too far off from the coach receiver height, use a drop or riser adapter in the receiver to get the tow bar close to level.
Former owner of 2004 American Tradition and several other RVs
Home is in the Ocala Nat'l Forest near Ocala, FL
Summers in Black Mountain, NC