Went up to the TH yesterday in my 2WD Xterra. High clearance is an absolute necessity on this road. I don‘t think I would try it in any les than an xterra. areas in the road are heavily rutted and there are some large dips and rocks to contend with. The road is wide enough to skirt around the worst parts usually, but I would say this is borderline 4WD - I slipped in a few parts and had a to hit a few obstacles with momentum to avoid getting stuck. Not too much water on the road, but almost all of the dips had water in them.
The moral of the story is - CLEARANCE NEEDED.