F.E.D trailer history?

I just picked this trailer up from an elderly lady in Farmington Hills, Michigan. She was using it to store antique wood trim in it for the last 30 years. Anyway, her husband passed away and she has no idea of the history on it and I was curious to see if anyone knew who manufactured it and where? She seemed to think it was built in Michigan in the mid-70's and it has no VIN# or any other numbers on it. Any info would be appreciated. Thanks!

 

looks homemade to me, but done sort of the way "mr. ed" brand trailers were built

 

Might even be from a "glider' plane..hard to tell..

Here is our Mr Ed trailer.

Rick

 

That was my exact thought with that little rise in the back. It looks a bit short for a glider though.