All ROADSMITH conversion kits come standard with a 2-inch trailer-hitch receiver port (basically the female end of the multi-piece setup that makes a complete trailer hitch). Thus, the first part you need to add to complete this setup is a draw bar, and the one RST sells is the perfect length and height for use with motorcycle trailers.
This draw bar universally fits every trike conversion kit ROADSMITH TRIKES currently sells.
NOTE: The third and final piece is the ball, which is not included in this kit as different trailers require different sizes. Refer to the owners manual of your trailer to find out what size it takes and they are available at any major auto parts store.