Here's my badge, on my 1979 B1700RGH built by Vanguard Trailers in Winfield, B.C.:
It is one of the rare references to Neonex on the trailer and it's documentation, and the only rendition of that logo which is more permanent than the side decals, but it doesn't provide the actual manufacturing company name (Neonex's Vanguard operation), or the plant location.
Mine is moulded in plastic so the text and graphic appear in relief - this will never fade away to a blank. I just noticed that it is held on by no less than three rivets; obviously, someone in Winfield thought that this was a critical component!
Someone I met years ago ran a sign shop, and had the facilities to make plastic badges like the ones used on cars. He made a custom badge for his Plymouth Volare in the same script style, but showing his name instead. Since the original information is gone, I think Pete is on the right track - how about a custom owner's plaque instead?
By the way, my Boler is not orange: the plaque is just mounted on the stripe above the belly joint.
And did everyone notice, at the bottom of Lizbeth's photo, the round ghosts of the stickers which are the subject of Kevin's topic, Is there Any Value in the CSA stickers?