Horse Trailers Oregon Need To Find VIN Number On A 1976 Murry Horse Trailer?

Need to find VIN number on a 1976 Murry horse Trailer? - horse trailers oregon

Where can I find the VIN number from 1976 Murry my horse trailer? I looked at the front door and in the Tonge and there. I bought the trailer, the title comes from Oregon and I live in Colorado, and he can no-longer the owner. If I do not find the VIN number How do I sign this trailer?