I would call EZ Loader. Are they still in business?
How about this:http://www.ezloader.com/company/faq/
Where do I find my Vehicle Identification Number?
The Vehicle Identification Number is located on a silver sticker at the front of the trailer on the inside of the rail on the passenger side. A decal is also placed on the bottom of the tongue of the trailer. For EZ Loader Custom Trailers only, if the silver sticker is faded you can find the last 5 digits of the VIN number stamped on top of the trailer frame, before the frame welds into the trailer tongue. EZ Loader can recover the complete VIN number with these 5 digits.