This is a Microsoft Publisher document that the local DSM guys were using a few years ago. They were printing it with a sticky face so it went on the inside of the windshield right at the VIN number.
http://roadraceengineering.com/ralliart/tech/awd towing warning sticker4.pub
If you have Publisher it is something that you can start with to play with. I'll ask them what they were printing it on. From what I remember it was just contact paper something you could get from Staples.
Mike W