Thanks to DP for drawing attention to a book by former WCG minister Paul Krautmann. The Rich Hiker's Guide to Walking with God was published in 2007, but I confess to never having heard of it before.
Substantial excerpts can be found on Google Books. This is apparently an evangelical Christian testimony. Click on the image for a section of the back cover blurb.
Krautmann seems to have been associated with the WCG/GCI in Perth, and John Klassek's now defunct Life Today magazine. (Since 2007 Klassek seems to have dumped WCG in favor of a relationship with Sabbatarian movements such as COG7 and Ron Dart - and his links page also appears to endorse Craig White's BI-promoting site. There is no indication that Krautmann is currently associated with Klassek.)
The Rich Hiker's Guide to Walking with Godis available through Amazon.