I'm curious to see what the trail looks like now. The first time I went up the dropoff I was in the back of a CJ in the '70's, it really was the devils dropoff. Over the past few years it's mellowed out considerably.
My first TJ run up it took 5 or 6 tries, but it was basically trying to climb a giant sand dune with a 4-banger and factory gearing on 33's.
The key is speed, sorta. You need to have momentum going by the time you hit the turn to the right as you approach the top. At the very top there's been a dip right at the edge, the normal line was to the left for years, last time it was easier, and safer, to the left. 2hi has always worked well, unless you have an LS or Hemi swap, then you can 4lo all the way
And yeah, the right tires, and airing down, make all the difference. Give it a whirl, what's the worst that can happen