The TransAmerica files are on the web site now. I don't know when Western Express will be ready, but I do know that it is a current project in the Routes & Mapping department.
You didn't say what software you use to transfer the waypoints into your GPSR. Any of the products mentioned in the GPS Data User Guide except Garmin MapSource will work with the Meridian.
Magellan's MapSend program has trouble with the GPX format now on the web site. One of our members recently tested it and found what I needed to correct that. He also very graciously wrote up a section for the User Guide about using MapSend. The revised GPX files and User Guide should appear on the web site when the remaining routes' data do.
Fred Hiltz, fhiltz at yahoo dot com
PS. You are setting off some nice memories here. I started my first XC trip in Berkeley, visited Yosemite and got through Tioga Pass on June 16 while the ground was still frozen, hence campgrounds closed. F