Jeff, I have the single-rail fold-up and store against the wall model. I have used it only on a handful of occasions to play rescue for folks. Kinda sad now that I think about it, I have this trailer that has never met my bike.
OK, OK, back to the topic. When I have used it, I have been really impressed. I have hauled a Heritage from Dallas back to Beaumont with no issues. I typically stop every 75-100 miles and check the ol' straps, but have never had a bike try to walk on me. The only downside, if there is one, is that when I haul the trailer with the tail folded onto the body, the trailer disappears from view and is so light that you hear every bump you hit.
