A word of caution first. In order to have a detailed rendering of the Rubicon Trail on your GPS, you could not load it as one continuous track - it would have too many individual waypoints. Your (consumer) GPS can not load tracks with more than 500 waypoints.
If you would attempt to load the entire trail data, your (consumer) GPS would truncate them to 500 points - resulting in an unusable depiction of the Rubicon Trail.
So I had to break down the entire trail into sections with no more than 500 waypoints each. I will refine the documents below in the coming months even more, so you can get a maximum of trail data within 20 tracks you can upload to your GPS
free download (gpx - universal)
free download (kmz - Google)