We needed to move the trailer that came with Davie today, but Davie is packed in and without a battery, so we used this method to allow Billy to move it. Without the rope there would be two pivot points for vertical "suspension" (in the pitch axis if you follow me) and that would have cancelled out the movement that would pivot on the mounting pin. The pics are not great as the light was going.
Sandy
If you look at some of my old posts (these I think are the best ones: viewtopic.php?f=3&t=8140 and viewtopic.php?f=2&t=8125) you'll see our drawbars, made locally many years ago and you might also see why Billy couldn't just drive away with it. If you need more pics I'll take some tomorrow.
Sandy
I see what you mean about what we did yesterday, but I don't see the comparison with it in normal working (when there's only one pivot point in each axis). Davie's drawbar is solid (welded up by a previous owner), while Billy's one does pivot in the pitch axis.
Sandy