Along the same lines of the Sluice having vegetation in the rocks, here's one for ya.
My wheeling buddy used to do Surprise Canyon, CA in a long wheel base International Travel-All without much problem.
and I've met the guy (Big Hands George) that drove the Pontiac (or Buick, I get them mixed up) up Surprise Canyon quite regularly in the old days.
Of course, after the big storms, Surprise Canyon became a winching exercise. Now it has a gate (that we're fighting).
The *good old days* don't stay the same for long.
Enjoy your days while you can.
Del