We occasionally get threads here about the music people listen to when they tour, but I've never seen one for audio books.
I listen to audio books when I bike tour (using only one earbud so I can still hear traffic noise). Not all of the books I listen to are great but some of them are fabulous. I get my books from the San Francisco library which has a huge collection. I listen to dozens of books every year and am creating a list of books that I would recommend to people.
I primarily listen to, and all the books I've recommended so far are, non-fiction.
I'd be very interested in audio books that you've heard and would (or wouldn't) recommend.
So far, my list includes
Legacy of Ashes
The Siege of Mecca
Lords of Finance
Joseph P. Kennedy Presents
Into the Wild
The Sweet Science
I am adding to the list daily as I go through those that I've listened to over the past 5 years.
I look forward to getting your suggestions.