Many thanks for these responses.
Serial looks good, but a long trip is a rare opportunity to settle into a lengthy plot or historical analysis. One of the Johnson biography volumes, or The Goldfinch come to mind. If I podded a trip like this, it'd probably be some iTunes University lectures. Thermodynamics anyone?
I read A Walk in the Woods about ten years ago, Mark - our tastes vary.
John McPhee - anything by him - is a winner, thanks Sharon. Was Assembling California an early version of Basin and Range, by the way?
Offliberty looks interesting, but I don't get it yet. That's quite a disclaimer.
Maybe I'll just listen to a bunch of Wodehouse on CD.