The conduit connectors made for a simpler layout for the trailer. The cross connectors can be either conduit connectors or steering stems from old bikes, whatever you have. the base part is two front wheels and four similar sized forks. Width can be anything you need. Picture below is to drop a 14" wide storage tub between the longitudinal pipes. Since some of the pipes are under tension, you need to add a set screw through the connectors to lock them in. A star nut for the trailer tongue makes connecting to the bicycle easy.