Good to know about the AWD, but the day I was there, the rangers were diverting all non-4WD back out, including most SUVs. Not sure if there was a recent policy change.

The one type of car they don't allow up, but really should are EVs as their regenerative braking systems would keep the downhill speed under control without using the brakes, plus you'd have a full charge on arrival into the parking lot (to make up for what was lost on the way up). Maybe they just need a few volunteers to demo them.