You can expand the Deluxe 12 combo up to an 18 unit using the DGR12up18 KIt. I know of no way to attach an GR 8 unit, which uses a tubing hub, to a deluxe style gourd rack which uses a bracket type hub. When expanding to an 18 unit you may want to consider an extension piece to add 2 more feet to your 14' pole. Lastly when adding the extension piece your 45' rope would be too short, so you will either have to add a piece of rope to it or purchase a new rope with or without pulleys.