By "drying" they actually mean pull the whole plant at the end of the season, tomatoes and all, and hang it upside down in a barn. If you're looking for good tomatoes to put in a dehydrator and make "sun dried" tomatoes, don't bother with them -- they are small and seedy. I found them not worth the time and effort.
Meaty plums and pastes actually make a better dried tomato.
Brokenbar (Mary) sold dried tomatoes to restaurants before retiring to Mexico. Many of us have used her list as the starting point --
http://tomatoville.com/showthread.php?t=20850