I love a good detective story.
I don't know if you've noticed, but the FGRV homepage has a list of all the Manufacturers right at the very top.
Each name is linked to a page with a little information about the trailer.
If you click on "Play Pac" the page it takes you to has nothing in that space but a big ol' question mark!
No info, no history...
Maybe you could volunteer to write a few words there- I'm sure anyone interested in the brand would find that very helpful.
If nothing else, posting the info about where to find the VIN
would be MUCH appreciated, as you yourself have very good reason to know.
Just a thought!