I read that, PTTA, a few years ago and loved it. The stuff they went thru was unbelievable, and they were lucky to live thru it.
Reminds me of another, more sedate, but quite beautiful book, River Horse, by William Least Heat Moon, describing his retracing of Lewis and Clark's expedition on a boat custom-made for the occasion, Nikawa, or River Horse.
Some quite gruelling passages, but nothing like PTTA. Also a lot of historical observations.
And every night they stop at whatever pub is closest to the river, and sample the local craft beer.
Geez, I'll have to read that again soon.