Biker Bar, the Fast and Easy Way to Secure a Bike on the Trailer [Video]
The Biker Bar solves the problem in a way which is easy, elegant (in case elegance is needed when transporting a bike) and safe. The Biker Bar is comprised of two distinct parts, one to be temporarily mounted on the bike and the other intended for trailer mounting.
So far the design only favors bikes such as choppers and similar machines, but further refinement could lead to expanding the range. The principle is as simple as it is effective: the trailer-side part has an automatic clamping system which securely grips the bar mounted underneath the bike.
All you have to do is secure the bar underneath the bike to be loaded onto the trailer and drive/ push the bike on the ramp carefully and slowly, until the bar mounted on the machine latches neatly in the hooks. And then... oh no, and then you drive, because that's it: the video shows it all.
Available for Harleys at the moment for $380 (€293), shipping included.