I looked it up on the DMV website,
Appendix 1E - California License Plate Data (1914-1980)
.0120 Trailer License Plates
License plates specifically identifying commercial trailers were introduced in 1918.
So i guess they cant be any use unless you have a commercial trailer. great price and...
thanks David im not looking to buy a coupe but wondering how only splash aprons look on a truck. i cant find any pictures anywhere so i bet it dosent look good at this point, thanks .