I wanted to have a true vintage plate that came with the trailer when it was new. In California, the plate on the 1961 was the 1956 plate with a 1961 sticker. I got a trailer plate off of ebay (above) and cleaned it up. I then repainted it with Old Caterpillar Yellow paint. I used sharpie for the black letters. I took the plate to our DMV and registered it in the Year of Manufacture (YOM) program. After it was approved, I put the plate on the back of the trailer!