I'm always looking for SF epics I can get behind.

Conveniently, Jim posts the first chapter of each book for free browsing:

https://www.jimchines.com/project/janitors/

...and there's an audio trailer as well! https://www.graphicaudio.net/our-productions/series/janitors-of-the-post-apocalypse.html

Weirdly the production company doesn't host Terminal Peace. Remarkably, the audio producers advise readers how to work around the devilish tendency of Audible to withdraw support for a title:

ZIP DOWNLOAD PURCHASES: If you purchase the mp3, m4b or flac option, then we recommend that you also download the zip files containing the audio from our website download section and back it up on your computer hard drive, because some titles or series may be removed at some point in the future due to licensing restrictions.