Now we're starting to have fun ... Rock Crawling  Some of these trails are definitely challenging.  I realizes what I knew all along.  I need lower gears.  It was slow going much of the day as we navigated trail after trail of boulder fields and rock trails.  We then came to this tricky hill climb.  Right in the middle of the trail and the only logical line up the hill towards the top, was a nice tall stump.  Tall enough to grab your axle or differential and stop any momentum you might have as it did with  few Jeeps.  The trick was to navigate a line to the left, climb your left wheels up on a boulder, avoid the tree, staying to the left of the stump.  Easier said than done as the loose rock kicked out from under the tires.