Bringing this thread back as Mark Smith was recently mentioned on another thread by
@AndyG and a Google search brought it up. The pdf link still works and it's a great read and not over complicated. A couple things I picked up, a dot on the top of the steering wheel when the wheels are straight ahead (although my steering wheel is already centered) and the hard wood dowels. Plus the reminders of some basic stuff like finding traction by turning the steering wheel back and forth and always clearing out as much as possible around the stuck vehicle before the recovery attempt.
One thing impressed me was the use of stock Jeeps with no lifts and 31" tires even for the Darien trip. I also noticed on page 10 he said it is not necessary to disconnect the front sway bar links on a TJ.
He also mentions to know your approach and departure angles but didn't explain how you actually do that, for me it's more of a guestimate unless there's more to it?
There's also some good pictures here
https://expeditionportal.com/the-passing-of-a-legend-mark-a-smith/ from some of the early day trips.