I know there are some on this forum that were asking a few weeks ago if a Garmin transponder could feed ADSB traffic and weather into a GRT screen. The great folks at Team Light Aviation in Rio Vista have helped me make it happen. I just upgraded my Horizon HS screens to Horizon EX screens. What a huge difference. And I was able to display traffic and weather on the screens from a GTX345.
Traffic and weather on a GRT screen from a Garmin gtx345 by Peter Anderson, on Flickr
Traffic and weather on a GRT screen from a Garmin gtx345 by Peter Anderson, on Flickr