From what I have seen on the road and at campgrounds, I am sure it went somewhere, once. Not sure how far either, but I am sure they at least tried it with all the work they put into it...
I only saw half the story a couple of summers ago, I was heading South on I-69 between Ft. Wayne and Indy, a "round body style" Dodge Caravan passed me, and it had a weight distribution hitch head on the back of it. I did not see what it had been pulling with the hitch, but it looks like the setup that I use to pull my 21' Travel Trailer that weighs 4500lbs.....